131257431 has 12 divisors (see below), whose sum is σ = 192192208. Its totient is φ = 86305824.

The previous prime is 131257429. The next prime is 131257433. The reversal of 131257431 is 134752131.

It is an interprime number because it is at equal distance from previous prime (131257429) and next prime (131257433).

It is not a de Polignac number, because 131257431 - 2¹ = 131257429 is a prime.

It is a super-2 number, since 2×131257431² = 34457026385439522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131257395 and 131257404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131257433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99235 + ... + 100548.

Almost surely, 2^131257431 is an apocalyptic number.

131257431 is a deficient number, since it is larger than the sum of its proper divisors (60934777).

131257431 is a wasteful number, since it uses less digits than its factorization.

131257431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199862 (or 199859 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 131257431 is about 11456.7635482277. The cubic root of 131257431 is about 508.2077691361.

The spelling of 131257431 in words is "one hundred thirty-one million, two hundred fifty-seven thousand, four hundred thirty-one".