56091647 has 4 divisors (see below), whose sum is σ = 56615976. Its totient is φ = 55567320.

The previous prime is 56091599. The next prime is 56091661. The reversal of 56091647 is 74619065.

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

It is a cyclic number.

It is not a de Polignac number, because 56091647 - 2¹⁰ = 56090623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56091647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56091677) 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, 262004 + ... + 262217.

It is an arithmetic number, because the mean of its divisors is an integer number (14153994).

Almost surely, 2^56091647 is an apocalyptic number.

56091647 is a deficient number, since it is larger than the sum of its proper divisors (524329).

56091647 is a wasteful number, since it uses less digits than its factorization.

56091647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524328.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 56091647 is about 7489.4356930279. The cubic root of 56091647 is about 382.7948304281.

The spelling of 56091647 in words is "fifty-six million, ninety-one thousand, six hundred forty-seven".