51515230 has 32 divisors (see below), whose sum is σ = 100364544. Its totient is φ = 18925056.

The previous prime is 51515227. The next prime is 51515249. The reversal of 51515230 is 3251515.

51515230 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28102 + ... + 29878.

It is an arithmetic number, because the mean of its divisors is an integer number (3136392).

Almost surely, 2^51515230 is an apocalyptic number.

51515230 is a deficient number, since it is larger than the sum of its proper divisors (48849314).

51515230 is a wasteful number, since it uses less digits than its factorization.

51515230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 51515230 is about 7177.4110931449. The cubic root of 51515230 is about 372.0876147352.

Adding to 51515230 its reverse (3251515), we get a palindrome (54766745).

The spelling of 51515230 in words is "fifty-one million, five hundred fifteen thousand, two hundred thirty".