56647581 has 4 divisors (see below), whose sum is σ = 75530112. Its totient is φ = 37765052.

The previous prime is 56647561. The next prime is 56647601. The reversal of 56647581 is 18574665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (56647561) and next prime (56647601).

It is a cyclic number.

It is not a de Polignac number, because 56647581 - 2⁶ = 56647517 is a prime.

It is a super-2 number, since 2×56647581² = 6417896866303122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56647561) 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, 9441261 + ... + 9441266.

It is an arithmetic number, because the mean of its divisors is an integer number (18882528).

Almost surely, 2^56647581 is an apocalyptic number.

It is an amenable number.

56647581 is a deficient number, since it is larger than the sum of its proper divisors (18882531).

56647581 is a wasteful number, since it uses less digits than its factorization.

56647581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18882530.

The product of its digits is 201600, while the sum is 42.

The square root of 56647581 is about 7526.4587290438. The cubic root of 56647581 is about 384.0553237890.

The spelling of 56647581 in words is "fifty-six million, six hundred forty-seven thousand, five hundred eighty-one".