31533191968 has 48 divisors (see below), whose sum is σ = 62326381824. Its totient is φ = 15704386560.

The previous prime is 31533191957. The next prime is 31533191969. The reversal of 31533191968 is 86919133513.

It is not an unprimeable number, because it can be changed into a prime (31533191969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17744296 + ... + 17746072.

It is an arithmetic number, because the mean of its divisors is an integer number (1298466288).

Almost surely, 2^31533191968 is an apocalyptic number.

It is an amenable number.

31533191968 is a deficient number, since it is larger than the sum of its proper divisors (30793189856).

31533191968 is a wasteful number, since it uses less digits than its factorization.

31533191968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665 (or 3657 counting only the distinct ones).

The product of its digits is 524880, while the sum is 49.

The spelling of 31533191968 in words is "thirty-one billion, five hundred thirty-three million, one hundred ninety-one thousand, nine hundred sixty-eight".