31968557 has 2 divisors, whose sum is σ = 31968558. Its totient is φ = 31968556.

The previous prime is 31968553. The next prime is 31968589. The reversal of 31968557 is 75586913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31967716 + 841 = 5654^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 31968557 - 2² = 31968553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31968553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15984278 + 15984279.

It is an arithmetic number, because the mean of its divisors is an integer number (15984279).

Almost surely, 2^31968557 is an apocalyptic number.

It is an amenable number.

31968557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31968557 is an equidigital number, since it uses as much as digits as its factorization.

31968557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 31968557 is about 5654.0743716368. The cubic root of 31968557 is about 317.3761916266.

The spelling of 31968557 in words is "thirty-one million, nine hundred sixty-eight thousand, five hundred fifty-seven".