31031020431 has 16 divisors (see below), whose sum is σ = 48676111200. Its totient is φ = 19470443904.

The previous prime is 31031020411. The next prime is 31031020523. The reversal of 31031020431 is 13402013013.

31031020431 is a `hidden beast` number, since 310 + 310 + 2 + 0 + 43 + 1 = 666.

It is not a de Polignac number, because 31031020431 - 2⁷ = 31031020303 is a prime.

It is a super-2 number, since 2×31031020431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031020411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33802396 + ... + 33803313.

It is an arithmetic number, because the mean of its divisors is an integer number (3042256950).

Almost surely, 2^31031020431 is an apocalyptic number.

31031020431 is a deficient number, since it is larger than the sum of its proper divisors (17645090769).

31031020431 is a wasteful number, since it uses less digits than its factorization.

31031020431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67605735 (or 67605729 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31031020431 its reverse (13402013013), we get a palindrome (44433033444).

The spelling of 31031020431 in words is "thirty-one billion, thirty-one million, twenty thousand, four hundred thirty-one".