131251431 has 4 divisors (see below), whose sum is σ = 175001912. Its totient is φ = 87500952.

The previous prime is 131251357. The next prime is 131251433. The reversal of 131251431 is 134152131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131251431 - 2¹¹ = 131249383 is a prime.

It is a super-2 number, since 2×131251431² = 34453876279095522, 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 = 131251398 and 131251407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131251433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21875236 + ... + 21875241.

It is an arithmetic number, because the mean of its divisors is an integer number (43750478).

Almost surely, 2^131251431 is an apocalyptic number.

131251431 is a deficient number, since it is larger than the sum of its proper divisors (43750481).

131251431 is an equidigital number, since it uses as much as digits as its factorization.

131251431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43750480.

The product of its digits is 360, while the sum is 21.

The square root of 131251431 is about 11456.5016911796. The cubic root of 131251431 is about 508.2000253381.

The spelling of 131251431 in words is "one hundred thirty-one million, two hundred fifty-one thousand, four hundred thirty-one".