56711999 has 4 divisors (see below), whose sum is σ = 56756064. Its totient is φ = 56667936.

The previous prime is 56711987. The next prime is 56712041. The reversal of 56711999 is 99911765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99911765 = 5 ⋅19982353.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56711999 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 (56711909) 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, 20042 + ... + 22695.

It is an arithmetic number, because the mean of its divisors is an integer number (14189016).

Almost surely, 2^56711999 is an apocalyptic number.

56711999 is a deficient number, since it is larger than the sum of its proper divisors (44065).

56711999 is a wasteful number, since it uses less digits than its factorization.

56711999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44064.

The product of its digits is 153090, while the sum is 47.

The square root of 56711999 is about 7530.7369493297. The cubic root of 56711999 is about 384.2008475309.

The spelling of 56711999 in words is "fifty-six million, seven hundred eleven thousand, nine hundred ninety-nine".