56909533 has 4 divisors (see below), whose sum is σ = 57056220. Its totient is φ = 56762848.

The previous prime is 56909509. The next prime is 56909539. The reversal of 56909533 is 33590965.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33590965 = 5 ⋅6718193.

It can be written as a sum of positive squares in 2 ways, for example, as 7601049 + 49308484 = 2757^2 + 7022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56909533 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 (56909539) 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, 72760 + ... + 73537.

It is an arithmetic number, because the mean of its divisors is an integer number (14264055).

Almost surely, 2^56909533 is an apocalyptic number.

It is an amenable number.

56909533 is a deficient number, since it is larger than the sum of its proper divisors (146687).

56909533 is a wasteful number, since it uses less digits than its factorization.

56909533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146686.

The product of its (nonzero) digits is 109350, while the sum is 40.

The square root of 56909533 is about 7543.8407326772. The cubic root of 56909533 is about 384.6464016022.

The spelling of 56909533 in words is "fifty-six million, nine hundred nine thousand, five hundred thirty-three".