31131311002 has 24 divisors (see below), whose sum is σ = 51836310036. Its totient is φ = 14010480000.

The previous prime is 31131310997. The next prime is 31131311027. The reversal of 31131311002 is 20011313113.

It can be written as a sum of positive squares in 2 ways, for example, as 30057503641 + 1073807361 = 173371^2 + 32769^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612399 + ... + 661282.

Almost surely, 2^31131311002 is an apocalyptic number.

31131311002 is a deficient number, since it is larger than the sum of its proper divisors (20704999034).

31131311002 is a wasteful number, since it uses less digits than its factorization.

31131311002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273806 (or 1273795 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31131311002 its reverse (20011313113), we get a palindrome (51142624115).

It can be divided in two parts, 311 and 31311002, that added together give a palindrome (31311313).

The spelling of 31131311002 in words is "thirty-one billion, one hundred thirty-one million, three hundred eleven thousand, two".