31997204722 has 48 divisors (see below), whose sum is σ = 58298666112. Its totient is φ = 13108011840.

The previous prime is 31997204641. The next prime is 31997204731. The reversal of 31997204722 is 22740279913.

It is a super-2 number, since 2×31997204722² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4123198 + ... + 4130950.

It is an arithmetic number, because the mean of its divisors is an integer number (1214555544).

Almost surely, 2^31997204722 is an apocalyptic number.

31997204722 is a deficient number, since it is larger than the sum of its proper divisors (26301461390).

31997204722 is a wasteful number, since it uses less digits than its factorization.

31997204722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623 (or 9616 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 31997204722 in words is "thirty-one billion, nine hundred ninety-seven million, two hundred four thousand, seven hundred twenty-two".