56581919 has 2 divisors, whose sum is σ = 56581920. Its totient is φ = 56581918.

The previous prime is 56581907. The next prime is 56581939. The reversal of 56581919 is 91918565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56581919 - 2¹² = 56577823 is a prime.

It is a super-2 number, since 2×56581919² = 6403027115445122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56581919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56581939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28290959 + 28290960.

It is an arithmetic number, because the mean of its divisors is an integer number (28290960).

Almost surely, 2^56581919 is an apocalyptic number.

56581919 is a deficient number, since it is larger than the sum of its proper divisors (1).

56581919 is an equidigital number, since it uses as much as digits as its factorization.

56581919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 44.

The square root of 56581919 is about 7522.0953862604. The cubic root of 56581919 is about 383.9068761995.

The spelling of 56581919 in words is "fifty-six million, five hundred eighty-one thousand, nine hundred nineteen".