131231023431 has 8 divisors (see below), whose sum is σ = 175281135744. Its totient is φ = 87334130040.

The previous prime is 131231023379. The next prime is 131231023457. The reversal of 131231023431 is 134320132131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131231023431 - 2⁶ = 131231023367 is a prime.

It is a super-2 number, since 2×131231023431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231023471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38302731 + ... + 38306156.

It is an arithmetic number, because the mean of its divisors is an integer number (21910141968).

Almost surely, 2^131231023431 is an apocalyptic number.

131231023431 is a deficient number, since it is larger than the sum of its proper divisors (44050112313).

131231023431 is an equidigital number, since it uses as much as digits as its factorization.

131231023431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76609461.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 131231023431 its reverse (134320132131), we get a palindrome (265551155562).

The spelling of 131231023431 in words is "one hundred thirty-one billion, two hundred thirty-one million, twenty-three thousand, four hundred thirty-one".