31025020431 has 4 divisors (see below), whose sum is σ = 41366693912. Its totient is φ = 20683346952.

The previous prime is 31025020421. The next prime is 31025020483. The reversal of 31025020431 is 13402052013.

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

It is not a de Polignac number, because 31025020431 - 2⁷ = 31025020303 is a prime.

It is a super-2 number, since 2×31025020431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31025020398 and 31025020407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31025020421) 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, 5170836736 + ... + 5170836741.

It is an arithmetic number, because the mean of its divisors is an integer number (10341673478).

Almost surely, 2^31025020431 is an apocalyptic number.

31025020431 is a deficient number, since it is larger than the sum of its proper divisors (10341673481).

31025020431 is a wasteful number, since it uses less digits than its factorization.

31025020431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10341673480.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 31025020431 its reverse (13402052013), we get a palindrome (44427072444).

The spelling of 31025020431 in words is "thirty-one billion, twenty-five million, twenty thousand, four hundred thirty-one".