56521575 has 72 divisors (see below), whose sum is σ = 113336496. Its totient is φ = 26688000.

The previous prime is 56521571. The next prime is 56521601. The reversal of 56521575 is 57512565.

It is a happy number.

56521575 is a `hidden beast` number, since 5 + 65 + 21 + 575 = 666.

It is not a de Polignac number, because 56521575 - 2² = 56521571 is a prime.

Its product of digits (52500) is a multiple of the sum of its prime factors (625).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56521571) 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 71 ways as a sum of consecutive naturals, for example, 101197 + ... + 101753.

It is an arithmetic number, because the mean of its divisors is an integer number (1574118).

Almost surely, 2^56521575 is an apocalyptic number.

56521575 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56521575 is an abundant number, since it is smaller than the sum of its proper divisors (56814921).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56521575 is a wasteful number, since it uses less digits than its factorization.

56521575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 617 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 56521575 is about 7518.0831998589. The cubic root of 56521575 is about 383.7703501535.

It can be divided in two parts, 5652 and 1575, that added together give a palindrome (7227).

The spelling of 56521575 in words is "fifty-six million, five hundred twenty-one thousand, five hundred seventy-five".