31523530431 has 8 divisors (see below), whose sum is σ = 42068607280. Its totient is φ = 20997070272.

The previous prime is 31523530427. The next prime is 31523530453. The reversal of 31523530431 is 13403532513.

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

It is not a de Polignac number, because 31523530431 - 2² = 31523530427 is a prime.

It is a super-2 number, since 2×31523530431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31523530421) 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, 4650220 + ... + 4656993.

It is an arithmetic number, because the mean of its divisors is an integer number (5258575910).

Almost surely, 2^31523530431 is an apocalyptic number.

31523530431 is a deficient number, since it is larger than the sum of its proper divisors (10545076849).

31523530431 is a wasteful number, since it uses less digits than its factorization.

31523530431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308345.

The product of its (nonzero) digits is 16200, while the sum is 30.

The spelling of 31523530431 in words is "thirty-one billion, five hundred twenty-three million, five hundred thirty thousand, four hundred thirty-one".