31312103031 has 18 divisors (see below), whose sum is σ = 49714075320. Its totient is φ = 18977031480.

The previous prime is 31312103029. The next prime is 31312103033. The reversal of 31312103031 is 13030121313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31312103029) and next prime (31312103033).

It is not a de Polignac number, because 31312103031 - 2¹ = 31312103029 is a prime.

It is a super-2 number, since 2×31312103031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31312102995 and 31312103013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312103033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14375451 + ... + 14377628.

Almost surely, 2^31312103031 is an apocalyptic number.

31312103031 is a deficient number, since it is larger than the sum of its proper divisors (18401972289).

31312103031 is a wasteful number, since it uses less digits than its factorization.

31312103031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28753107 (or 28753093 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31312103031 its reverse (13030121313), we get a palindrome (44342224344).

The spelling of 31312103031 in words is "thirty-one billion, three hundred twelve million, one hundred three thousand, thirty-one".