51587265 has 32 divisors (see below), whose sum is σ = 88304256. Its totient is φ = 25625600.

The previous prime is 51587257. The next prime is 51587269. The reversal of 51587265 is 56278515.

It is not a de Polignac number, because 51587265 - 2³ = 51587257 is a prime.

It is a super-2 number, since 2×51587265² = 5322491820360450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51587269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24754 + ... + 26756.

It is an arithmetic number, because the mean of its divisors is an integer number (2759508).

Almost surely, 2^51587265 is an apocalyptic number.

It is an amenable number.

51587265 is a deficient number, since it is larger than the sum of its proper divisors (36716991).

51587265 is a wasteful number, since it uses less digits than its factorization.

51587265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129.

The product of its digits is 84000, while the sum is 39.

The square root of 51587265 is about 7182.4275144271. The cubic root of 51587265 is about 372.2609670155.

The spelling of 51587265 in words is "fifty-one million, five hundred eighty-seven thousand, two hundred sixty-five".