56591999 has 8 divisors (see below), whose sum is σ = 58010832. Its totient is φ = 55177920.

The previous prime is 56591987. The next prime is 56592007. The reversal of 56591999 is 99919565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56591999 is a prime.

It is a super-3 number, since 3×56591999³ (a number of 24 digits) contains 333 as substring.

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 56591999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56591959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40289 + ... + 41669.

It is an arithmetic number, because the mean of its divisors is an integer number (7251354).

Almost surely, 2^56591999 is an apocalyptic number.

56591999 is a deficient number, since it is larger than the sum of its proper divisors (1418833).

56591999 is a wasteful number, since it uses less digits than its factorization.

56591999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377.

The product of its digits is 984150, while the sum is 53.

The square root of 56591999 is about 7522.7653824907. The cubic root of 56591999 is about 383.9296723601.

The spelling of 56591999 in words is "fifty-six million, five hundred ninety-one thousand, nine hundred ninety-nine".