31721332554 has 12 divisors (see below), whose sum is σ = 68729553906. Its totient is φ = 10573777512.

The previous prime is 31721332553. The next prime is 31721332607. The reversal of 31721332554 is 45523312713.

31721332554 is a `hidden beast` number, since 3 + 1 + 72 + 1 + 3 + 32 + 554 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28441136025 + 3280196529 = 168645^2 + 57273^2 .

It is not an unprimeable number, because it can be changed into a prime (31721332553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 881148109 + ... + 881148144.

Almost surely, 2^31721332554 is an apocalyptic number.

31721332554 is an abundant number, since it is smaller than the sum of its proper divisors (37008221352).

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

31721332554 is a wasteful number, since it uses less digits than its factorization.

31721332554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762296261 (or 1762296258 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The spelling of 31721332554 in words is "thirty-one billion, seven hundred twenty-one million, three hundred thirty-two thousand, five hundred fifty-four".