56711551 has 4 divisors (see below), whose sum is σ = 61073992. Its totient is φ = 52349112.

The previous prime is 56711549. The next prime is 56711573. The reversal of 56711551 is 15511765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15511765 = 5 ⋅3102353.

It is a cyclic number.

It is not a de Polignac number, because 56711551 - 2¹ = 56711549 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 (56711521) 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, 2181201 + ... + 2181226.

It is an arithmetic number, because the mean of its divisors is an integer number (15268498).

Almost surely, 2^56711551 is an apocalyptic number.

56711551 is a deficient number, since it is larger than the sum of its proper divisors (4362441).

56711551 is a wasteful number, since it uses less digits than its factorization.

56711551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362440.

The product of its digits is 5250, while the sum is 31.

The square root of 56711551 is about 7530.7072045061. The cubic root of 56711551 is about 384.1998358553.

The spelling of 56711551 in words is "fifty-six million, seven hundred eleven thousand, five hundred fifty-one".