56573731 has 2 divisors, whose sum is σ = 56573732. Its totient is φ = 56573730.

The previous prime is 56573719. The next prime is 56573749. The reversal of 56573731 is 13737565.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56573731 - 2⁹ = 56573219 is a prime.

It is a super-2 number, since 2×56573731² = 6401174078520722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56573701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28286865 + 28286866.

It is an arithmetic number, because the mean of its divisors is an integer number (28286866).

Almost surely, 2^56573731 is an apocalyptic number.

56573731 is a deficient number, since it is larger than the sum of its proper divisors (1).

56573731 is an equidigital number, since it uses as much as digits as its factorization.

56573731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66150, while the sum is 37.

The square root of 56573731 is about 7521.5511033297. The cubic root of 56573731 is about 383.8883568491. Note that the first 3 decimals are identical.

The spelling of 56573731 in words is "fifty-six million, five hundred seventy-three thousand, seven hundred thirty-one".