56261921 has 2 divisors, whose sum is σ = 56261922. Its totient is φ = 56261920.

The previous prime is 56261917. The next prime is 56261929. The reversal of 56261921 is 12916265.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 13424896 = 6545^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 56261921 - 2² = 56261917 is a prime.

It is a super-2 number, since 2×56261921² = 6330807509220482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56261929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28130960 + 28130961.

It is an arithmetic number, because the mean of its divisors is an integer number (28130961).

Almost surely, 2^56261921 is an apocalyptic number.

It is an amenable number.

56261921 is a deficient number, since it is larger than the sum of its proper divisors (1).

56261921 is an equidigital number, since it uses as much as digits as its factorization.

56261921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 56261921 is about 7500.7946912311. The cubic root of 56261921 is about 383.1817814693.

The spelling of 56261921 in words is "fifty-six million, two hundred sixty-one thousand, nine hundred twenty-one".