56055991 has 8 divisors (see below), whose sum is σ = 59318784. Its totient is φ = 52862040.

The previous prime is 56055971. The next prime is 56056001. The reversal of 56055991 is 19955065.

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

It is a cyclic number.

It is not a de Polignac number, because 56055991 - 2¹⁷ = 55924919 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 (56055911) 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, 15531 + ... + 18796.

It is an arithmetic number, because the mean of its divisors is an integer number (7414848).

Almost surely, 2^56055991 is an apocalyptic number.

56055991 is a deficient number, since it is larger than the sum of its proper divisors (3262793).

56055991 is a wasteful number, since it uses less digits than its factorization.

56055991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34421.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 56055991 is about 7487.0548949504. The cubic root of 56055991 is about 382.7137023320.

The spelling of 56055991 in words is "fifty-six million, fifty-five thousand, nine hundred ninety-one".