51151515 has 16 divisors (see below), whose sum is σ = 86150400. Its totient is φ = 25844832.

The previous prime is 51151493. The next prime is 51151523. The reversal of 51151515 is 51515115.

It is not a de Polignac number, because 51151515 - 2⁵ = 51151483 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89455 + ... + 90024.

It is an arithmetic number, because the mean of its divisors is an integer number (5384400).

Almost surely, 2^51151515 is an apocalyptic number.

51151515 is a deficient number, since it is larger than the sum of its proper divisors (34998885).

51151515 is a wasteful number, since it uses less digits than its factorization.

51151515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179506.

The product of its digits is 625, while the sum is 24.

The square root of 51151515 is about 7152.0287331638. The cubic root of 51151515 is about 371.2098574651.

It can be divided in two parts, 5 and 1151515, that multiplied together give a palindrome (5757575).

The spelling of 51151515 in words is "fifty-one million, one hundred fifty-one thousand, five hundred fifteen".