56621599 has 4 divisors (see below), whose sum is σ = 56640600. Its totient is φ = 56602600.

The previous prime is 56621573. The next prime is 56621623. The reversal of 56621599 is 99512665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56621599 - 2⁷ = 56621471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56621099) 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 in 3 ways as a sum of consecutive naturals, for example, 3949 + ... + 11350.

It is an arithmetic number, because the mean of its divisors is an integer number (14160150).

Almost surely, 2^56621599 is an apocalyptic number.

56621599 is a deficient number, since it is larger than the sum of its proper divisors (19001).

56621599 is a wasteful number, since it uses less digits than its factorization.

56621599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19000.

The product of its digits is 145800, while the sum is 43.

The square root of 56621599 is about 7524.7324869393. The cubic root of 56621599 is about 383.9965978250.

The spelling of 56621599 in words is "fifty-six million, six hundred twenty-one thousand, five hundred ninety-nine".