56555999 has 4 divisors (see below), whose sum is σ = 56840400. Its totient is φ = 56271600.

The previous prime is 56555977. The next prime is 56556013. The reversal of 56555999 is 99955565.

It is a happy number.

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 56555999 - 2¹² = 56551903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56555999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56555909) 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, 141902 + ... + 142299.

It is an arithmetic number, because the mean of its divisors is an integer number (14210100).

Almost surely, 2^56555999 is an apocalyptic number.

56555999 is a deficient number, since it is larger than the sum of its proper divisors (284401).

56555999 is a wasteful number, since it uses less digits than its factorization.

56555999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284400.

The product of its digits is 2733750, while the sum is 53.

The square root of 56555999 is about 7520.3722647220. The cubic root of 56555999 is about 383.8482450662.

The spelling of 56555999 in words is "fifty-six million, five hundred fifty-five thousand, nine hundred ninety-nine".