56609999 has 4 divisors (see below), whose sum is σ = 58436160. Its totient is φ = 54783840.

The previous prime is 56609981. The next prime is 56610007. The reversal of 56609999 is 99990665.

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 56609999 - 2⁸ = 56609743 is a prime.

It is a Duffinian number.

56609999 is a modest number, since divided by 9999 gives 5660 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 56609999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56609929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913034 + ... + 913095.

It is an arithmetic number, because the mean of its divisors is an integer number (14609040).

Almost surely, 2^56609999 is an apocalyptic number.

56609999 is a deficient number, since it is larger than the sum of its proper divisors (1826161).

56609999 is a wasteful number, since it uses less digits than its factorization.

56609999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826160.

The product of its (nonzero) digits is 1180980, while the sum is 53.

The square root of 56609999 is about 7523.9616559363. The cubic root of 56609999 is about 383.9703730578.

The spelling of 56609999 in words is "fifty-six million, six hundred nine thousand, nine hundred ninety-nine".