56540819 has 2 divisors, whose sum is σ = 56540820. Its totient is φ = 56540818.

The previous prime is 56540801. The next prime is 56540843. The reversal of 56540819 is 91804565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56540819 - 2²⁰ = 55492243 is a prime.

It is a super-2 number, since 2×56540819² = 6393728426381522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56540879) 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, 28270409 + 28270410.

It is an arithmetic number, because the mean of its divisors is an integer number (28270410).

Almost surely, 2^56540819 is an apocalyptic number.

56540819 is a deficient number, since it is larger than the sum of its proper divisors (1).

56540819 is an equidigital number, since it uses as much as digits as its factorization.

56540819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 56540819 is about 7519.3629384410. The cubic root of 56540819 is about 383.8138995334.

The spelling of 56540819 in words is "fifty-six million, five hundred forty thousand, eight hundred nineteen".