31013023031 has 4 divisors (see below), whose sum is σ = 31031628792. Its totient is φ = 30994417272.

The previous prime is 31013023021. The next prime is 31013023051. The reversal of 31013023031 is 13032031013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13032031013 = 19727 ⋅660619.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31013023031 is a prime.

It is a super-2 number, since 2×31013023031² (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 (31013023001) 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, 9300380 + ... + 9303713.

It is an arithmetic number, because the mean of its divisors is an integer number (7757907198).

Almost surely, 2^31013023031 is an apocalyptic number.

31013023031 is a deficient number, since it is larger than the sum of its proper divisors (18605761).

31013023031 is a wasteful number, since it uses less digits than its factorization.

31013023031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18605760.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31013023031 its reverse (13032031013), we get a palindrome (44045054044).

The spelling of 31013023031 in words is "thirty-one billion, thirteen million, twenty-three thousand, thirty-one".