56908921 has 2 divisors, whose sum is σ = 56908922. Its totient is φ = 56908920.

The previous prime is 56908919. The next prime is 56908937. The reversal of 56908921 is 12980965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36433296 + 20475625 = 6036^2 + 4525^2 .

It is a cyclic number.

It is not a de Polignac number, because 56908921 - 2¹ = 56908919 is a prime.

Together with 56908919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56908421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28454460 + 28454461.

It is an arithmetic number, because the mean of its divisors is an integer number (28454461).

Almost surely, 2^56908921 is an apocalyptic number.

It is an amenable number.

56908921 is a deficient number, since it is larger than the sum of its proper divisors (1).

56908921 is an equidigital number, since it uses as much as digits as its factorization.

56908921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 56908921 is about 7543.8001696758. The cubic root of 56908921 is about 384.6450227796.

The spelling of 56908921 in words is "fifty-six million, nine hundred eight thousand, nine hundred twenty-one".