31680893 has 2 divisors, whose sum is σ = 31680894. Its totient is φ = 31680892.

The previous prime is 31680889. The next prime is 31680919. The reversal of 31680893 is 39808613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 5189284 = 5147^2 + 2278^2 .

It is a cyclic number.

It is not a de Polignac number, because 31680893 - 2² = 31680889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31680833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15840446 + 15840447.

It is an arithmetic number, because the mean of its divisors is an integer number (15840447).

Almost surely, 2^31680893 is an apocalyptic number.

It is an amenable number.

31680893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31680893 is an equidigital number, since it uses as much as digits as its factorization.

31680893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 31680893 is about 5628.5782396623. The cubic root of 31680893 is about 316.4213687918.

The spelling of 31680893 in words is "thirty-one million, six hundred eighty thousand, eight hundred ninety-three".