56406991 has 8 divisors (see below), whose sum is σ = 59460480. Its totient is φ = 53362008.

The previous prime is 56406989. The next prime is 56407007. The reversal of 56406991 is 19960465.

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 56406991 - 2¹ = 56406989 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 (56406491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15180 + ... + 18526.

It is an arithmetic number, because the mean of its divisors is an integer number (7432560).

Almost surely, 2^56406991 is an apocalyptic number.

56406991 is a deficient number, since it is larger than the sum of its proper divisors (3053489).

56406991 is a wasteful number, since it uses less digits than its factorization.

56406991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4253.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 56406991 is about 7510.4587742694. The cubic root of 56406991 is about 383.5108404538.

The spelling of 56406991 in words is "fifty-six million, four hundred six thousand, nine hundred ninety-one".