31031402000 has 80 divisors (see below), whose sum is σ = 76091094144. Its totient is φ = 12237680000.

The previous prime is 31031401991. The next prime is 31031402023. The reversal of 31031402000 is 20413013.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32735 + ... + 251265.

Almost surely, 2^31031402000 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 31031402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38045547072).

31031402000 is an abundant number, since it is smaller than the sum of its proper divisors (45059692144).

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

31031402000 is a wasteful number, since it uses less digits than its factorization.

31031402000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218625 (or 218609 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31031402000 its reverse (20413013), we get a palindrome (31051815013).

The spelling of 31031402000 in words is "thirty-one billion, thirty-one million, four hundred two thousand".