51536569 has 8 divisors (see below), whose sum is σ = 61999040. Its totient is φ = 41849136.

The previous prime is 51536561. The next prime is 51536587. The reversal of 51536569 is 96563515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51536569 - 2³ = 51536561 is a prime.

It is a super-2 number, since 2×51536569² = 5312035888583522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51536561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193614 + ... + 193879.

It is an arithmetic number, because the mean of its divisors is an integer number (7749880).

Almost surely, 2^51536569 is an apocalyptic number.

It is an amenable number.

51536569 is a deficient number, since it is larger than the sum of its proper divisors (10462471).

51536569 is a wasteful number, since it uses less digits than its factorization.

51536569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387519.

The product of its digits is 121500, while the sum is 40.

The square root of 51536569 is about 7178.8974780254. The cubic root of 51536569 is about 372.1389838904.

The spelling of 51536569 in words is "fifty-one million, five hundred thirty-six thousand, five hundred sixty-nine".