31031621300 has 36 divisors (see below), whose sum is σ = 67367003340. Its totient is φ = 12407416320.

The previous prime is 31031621287. The next prime is 31031621329. The reversal of 31031621300 is 312613013.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7666053136 + 23365568164 = 87556^2 + 152858^2 .

It is a super-2 number, since 2×31031621300² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 177506 + ... + 305894.

Almost surely, 2^31031621300 is an apocalyptic number.

It is an amenable number.

31031621300 is an abundant number, since it is smaller than the sum of its proper divisors (36335382040).

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

31031621300 is a wasteful number, since it uses less digits than its factorization.

31031621300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130820 (or 130813 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The spelling of 31031621300 in words is "thirty-one billion, thirty-one million, six hundred twenty-one thousand, three hundred".