56391671 has 8 divisors (see below), whose sum is σ = 64694784. Its totient is φ = 48150360.

The previous prime is 56391661. The next prime is 56391691. The reversal of 56391671 is 17619365.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56391671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56391641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13475 + ... + 17156.

It is an arithmetic number, because the mean of its divisors is an integer number (8086848).

Almost surely, 2^56391671 is an apocalyptic number.

56391671 is a deficient number, since it is larger than the sum of its proper divisors (8303113).

56391671 is a wasteful number, since it uses less digits than its factorization.

56391671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30901.

The product of its digits is 34020, while the sum is 38.

The square root of 56391671 is about 7509.4387939446. The cubic root of 56391671 is about 383.4761171097.

The spelling of 56391671 in words is "fifty-six million, three hundred ninety-one thousand, six hundred seventy-one".