51501565 has 8 divisors (see below), whose sum is σ = 61850880. Its totient is φ = 41168592.

The previous prime is 51501557. The next prime is 51501587. The reversal of 51501565 is 56510515.

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

It is a cyclic number.

It is not a de Polignac number, because 51501565 - 2³ = 51501557 is a prime.

It is a super-2 number, since 2×51501565² = 5304822394898450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4492 + ... + 11098.

It is an arithmetic number, because the mean of its divisors is an integer number (7731360).

Almost surely, 2^51501565 is an apocalyptic number.

It is an amenable number.

51501565 is a deficient number, since it is larger than the sum of its proper divisors (10349315).

51501565 is a wasteful number, since it uses less digits than its factorization.

51501565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8171.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51501565 is about 7176.4590850920. The cubic root of 51501565 is about 372.0547116700.

The spelling of 51501565 in words is "fifty-one million, five hundred one thousand, five hundred sixty-five".