56218999 has 4 divisors (see below), whose sum is σ = 56396664. Its totient is φ = 56041336.

The previous prime is 56218993. The next prime is 56219011. The reversal of 56218999 is 99981265.

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 56218999 - 2³ = 56218991 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 (56218991) 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 in 3 ways as a sum of consecutive naturals, for example, 88357 + ... + 88990.

It is an arithmetic number, because the mean of its divisors is an integer number (14099166).

Almost surely, 2^56218999 is an apocalyptic number.

56218999 is a deficient number, since it is larger than the sum of its proper divisors (177665).

56218999 is a wasteful number, since it uses less digits than its factorization.

56218999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177664.

The product of its digits is 349920, while the sum is 49.

The square root of 56218999 is about 7497.9329818291. The cubic root of 56218999 is about 383.0843140506.

The spelling of 56218999 in words is "fifty-six million, two hundred eighteen thousand, nine hundred ninety-nine".