31131312200 has 48 divisors (see below), whose sum is σ = 72780276660. Its totient is φ = 12383712000.

The previous prime is 31131312193. The next prime is 31131312239. The reversal of 31131312200 is 221313113.

It can be written as a sum of positive squares in 6 ways, for example, as 10653129796 + 20478182404 = 103214^2 + 143102^2 .

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, 393791 + ... + 466190.

Almost surely, 2^31131312200 is an apocalyptic number.

It is an amenable number.

31131312200 is an abundant number, since it is smaller than the sum of its proper divisors (41648964460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31131312200 is a wasteful number, since it uses less digits than its factorization.

31131312200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860178 (or 860169 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31131312200 its reverse (221313113), we get a palindrome (31352625313).

The spelling of 31131312200 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, two hundred".