51515271 has 12 divisors (see below), whose sum is σ = 77167272. Its totient is φ = 34343352.

The previous prime is 51515249. The next prime is 51515279. The reversal of 51515271 is 17251515.

It is not a de Polignac number, because 51515271 - 2¹⁷ = 51384199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105756 + ... + 106241.

It is an arithmetic number, because the mean of its divisors is an integer number (6430606).

Almost surely, 2^51515271 is an apocalyptic number.

51515271 is a deficient number, since it is larger than the sum of its proper divisors (25652001).

51515271 is an equidigital number, since it uses as much as digits as its factorization.

51515271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212012 (or 212000 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 51515271 is about 7177.4139493274. The cubic root of 51515271 is about 372.0877134476.

Adding to 51515271 its reverse (17251515), we get a palindrome (68766786).

The spelling of 51515271 in words is "fifty-one million, five hundred fifteen thousand, two hundred seventy-one".