56391001 has 2 divisors, whose sum is σ = 56391002. Its totient is φ = 56391000.

The previous prime is 56390959. The next prime is 56391007. The reversal of 56391001 is 10019365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33120025 + 23270976 = 5755^2 + 4824^2 .

It is a cyclic number.

It is not a de Polignac number, because 56391001 - 2¹⁵ = 56358233 is a prime.

It is not a weakly prime, because it can be changed into another prime (56391007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28195500 + 28195501.

It is an arithmetic number, because the mean of its divisors is an integer number (28195501).

Almost surely, 2^56391001 is an apocalyptic number.

It is an amenable number.

56391001 is a deficient number, since it is larger than the sum of its proper divisors (1).

56391001 is an equidigital number, since it uses as much as digits as its factorization.

56391001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 56391001 is about 7509.3941832880. The cubic root of 56391001 is about 383.4745983865.

The spelling of 56391001 in words is "fifty-six million, three hundred ninety-one thousand, one".