31097699940 has 96 divisors (see below), whose sum is σ = 89187840000. Its totient is φ = 8093388672.

The previous prime is 31097699921. The next prime is 31097699987. The reversal of 31097699940 is 4999679013.

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 31 ways as a sum of consecutive naturals, for example, 460461 + ... + 523659.

It is an arithmetic number, because the mean of its divisors is an integer number (929040000).

Almost surely, 2^31097699940 is an apocalyptic number.

31097699940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31097699940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44593920000).

31097699940 is an abundant number, since it is smaller than the sum of its proper divisors (58090140060).

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

31097699940 is a wasteful number, since it uses less digits than its factorization.

31097699940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63409 (or 63407 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 57.

The spelling of 31097699940 in words is "thirty-one billion, ninety-seven million, six hundred ninety-nine thousand, nine hundred forty".