31051021368 has 64 divisors (see below), whose sum is σ = 79550951040. Its totient is φ = 10094603904.

The previous prime is 31051021349. The next prime is 31051021399. The reversal of 31051021368 is 86312015013.

It is a Cunningham number, because it is equal to 176213²-1.

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 15 ways as a sum of consecutive naturals, for example, 682830 + ... + 726882.

It is an arithmetic number, because the mean of its divisors is an integer number (1242983610).

Almost surely, 2^31051021368 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 31051021368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39775475520).

31051021368 is an abundant number, since it is smaller than the sum of its proper divisors (48499929672).

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

31051021368 is a wasteful number, since it uses less digits than its factorization.

31051021368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44788 (or 44784 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 31051021368 in words is "thirty-one billion, fifty-one million, twenty-one thousand, three hundred sixty-eight".