31213747000 has 128 divisors (see below), whose sum is σ = 74181744000. Its totient is φ = 12291840000.

The previous prime is 31213746997. The next prime is 31213747027. The reversal of 31213747000 is 74731213.

It is a self number, because there is not a number n which added to its sum of digits gives 31213747000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20098224 + ... + 20099776.

It is an arithmetic number, because the mean of its divisors is an integer number (579544875).

Almost surely, 2^31213747000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31213747000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37090872000).

31213747000 is an abundant number, since it is smaller than the sum of its proper divisors (42967997000).

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

31213747000 is a wasteful number, since it uses less digits than its factorization.

31213747000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The spelling of 31213747000 in words is "thirty-one billion, two hundred thirteen million, seven hundred forty-seven thousand".