31312214031 has 32 divisors (see below), whose sum is σ = 50531420160. Its totient is φ = 16836558336.

The previous prime is 31312214027. The next prime is 31312214057. The reversal of 31312214031 is 13041221313.

It is not a de Polignac number, because 31312214031 - 2² = 31312214027 is a prime.

It is a super-2 number, since 2×31312214031² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 31312213989 and 31312214007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312214231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2946730 + ... + 2957336.

It is an arithmetic number, because the mean of its divisors is an integer number (1579106880).

Almost surely, 2^31312214031 is an apocalyptic number.

31312214031 is a deficient number, since it is larger than the sum of its proper divisors (19219206129).

31312214031 is a wasteful number, since it uses less digits than its factorization.

31312214031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18903.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31312214031 its reverse (13041221313), we get a palindrome (44353435344).

The spelling of 31312214031 in words is "thirty-one billion, three hundred twelve million, two hundred fourteen thousand, thirty-one".