56451791 has 4 divisors (see below), whose sum is σ = 61583784. Its totient is φ = 51319800.

The previous prime is 56451763. The next prime is 56451799. The reversal of 56451791 is 19715465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56451791 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 (56451799) 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, 2565980 + ... + 2566001.

It is an arithmetic number, because the mean of its divisors is an integer number (15395946).

Almost surely, 2^56451791 is an apocalyptic number.

56451791 is a deficient number, since it is larger than the sum of its proper divisors (5131993).

56451791 is a wasteful number, since it uses less digits than its factorization.

56451791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131992.

The product of its digits is 37800, while the sum is 38.

The square root of 56451791 is about 7513.4406898571. The cubic root of 56451791 is about 383.6123452421.

The spelling of 56451791 in words is "fifty-six million, four hundred fifty-one thousand, seven hundred ninety-one".