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Natural number

141 (one hundred [and] forty-one) is the natural number following 140 and preceding 142.

141 is:

a centered pentagonal number.^[1]
the sum of the sums of the divisors of the first 13 positive integers.^[2]
the second n to give a prime Cullen number (of the form n2ⁿ + 1).^[3]
an undulating number in base 10, with the previous being 131, and the next being 151.
the sixth hendecagonal (11-gonal) number.^[4]
a semiprime: a product of two prime numbers, namely 3 and 47. Since those prime factors are Gaussian primes, this means that 141 is a Blum integer.
a Hilbert prime

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