131451531 has 16 divisors (see below), whose sum is σ = 186283008. Its totient is φ = 82166400.

The previous prime is 131451517. The next prime is 131451539. The reversal of 131451531 is 135154131.

It is not a de Polignac number, because 131451531 - 2¹⁰ = 131450507 is a prime.

It is a super-2 number, since 2×131451531² = 34559010004487922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131451539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9066 + ... + 18576.

It is an arithmetic number, because the mean of its divisors is an integer number (11642688).

Almost surely, 2^131451531 is an apocalyptic number.

131451531 is a deficient number, since it is larger than the sum of its proper divisors (54831477).

131451531 is a wasteful number, since it uses less digits than its factorization.

131451531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9802.

The product of its digits is 900, while the sum is 24.

The square root of 131451531 is about 11465.2313975776. The cubic root of 131451531 is about 508.4581538026.

The spelling of 131451531 in words is "one hundred thirty-one million, four hundred fifty-one thousand, five hundred thirty-one".