56909969 has 4 divisors (see below), whose sum is σ = 57983796. Its totient is φ = 55836144.

The previous prime is 56909953. The next prime is 56909971. The reversal of 56909969 is 96990965.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96990965 = 5 ⋅19398193.

It can be written as a sum of positive squares in 2 ways, for example, as 47789569 + 9120400 = 6913^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 56909969 - 2⁴ = 56909953 is a prime.

It is a super-2 number, since 2×56909969² = 6477489143161922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1073773 = 56909969 / (5 + 6 + 9 + 0 + 9 + 9 + 6 + 9).

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 56909969.

It is not an unprimeable number, because it can be changed into a prime (56909929) 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, 536834 + ... + 536939.

It is an arithmetic number, because the mean of its divisors is an integer number (14495949).

Almost surely, 2^56909969 is an apocalyptic number.

It is an amenable number.

56909969 is a deficient number, since it is larger than the sum of its proper divisors (1073827).

56909969 is a wasteful number, since it uses less digits than its factorization.

56909969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073826.

The product of its (nonzero) digits is 1180980, while the sum is 53.

The square root of 56909969 is about 7543.8696303688. The cubic root of 56909969 is about 384.6473838946.

The spelling of 56909969 in words is "fifty-six million, nine hundred nine thousand, nine hundred sixty-nine".