56397569 has 4 divisors (see below), whose sum is σ = 57353520. Its totient is φ = 55441620.

The previous prime is 56397533. The next prime is 56397571. The reversal of 56397569 is 96579365.

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 a cyclic number.

It is not a de Polignac number, because 56397569 - 2¹² = 56393473 is a prime.

It is a super-2 number, since 2×56397569² = 6361371578219522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56397589) 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, 477887 + ... + 478004.

It is an arithmetic number, because the mean of its divisors is an integer number (14338380).

Almost surely, 2^56397569 is an apocalyptic number.

56397569 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

56397569 is a deficient number, since it is larger than the sum of its proper divisors (955951).

56397569 is an equidigital number, since it uses as much as digits as its factorization.

56397569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955950.

The product of its digits is 1530900, while the sum is 50.

The square root of 56397569 is about 7509.8314894543. The cubic root of 56397569 is about 383.4894858883.

The spelling of 56397569 in words is "fifty-six million, three hundred ninety-seven thousand, five hundred sixty-nine".