31311030031 has 12 divisors (see below), whose sum is σ = 33105847480. Its totient is φ = 29531483280.

The previous prime is 31311030029. The next prime is 31311030041. The reversal of 31311030031 is 13003011313.

It is not a de Polignac number, because 31311030031 - 2¹ = 31311030029 is a prime.

It is a super-2 number, since 2×31311030031² (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 = 31311029987 and 31311030014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311030001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 963061 + ... + 995041.

Almost surely, 2^31311030031 is an apocalyptic number.

31311030031 is a deficient number, since it is larger than the sum of its proper divisors (1794817449).

31311030031 is an equidigital number, since it uses as much as digits as its factorization.

31311030031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32454 (or 32227 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 16.

Adding to 31311030031 its reverse (13003011313), we get a palindrome (44314041344).

The spelling of 31311030031 in words is "thirty-one billion, three hundred eleven million, thirty thousand, thirty-one".