51023515 has 16 divisors (see below), whose sum is σ = 62512128. Its totient is φ = 39970656.

The previous prime is 51023509. The next prime is 51023519. The reversal of 51023515 is 51532015.

51023515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51023515 - 2¹⁹ = 50499227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51023519) by changing a digit.

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, 74364 + ... + 75046.

It is an arithmetic number, because the mean of its divisors is an integer number (3907008).

Almost surely, 2^51023515 is an apocalyptic number.

51023515 is a deficient number, since it is larger than the sum of its proper divisors (11488613).

51023515 is a wasteful number, since it uses less digits than its factorization.

51023515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978.

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

The square root of 51023515 is about 7143.0746181179. The cubic root of 51023515 is about 370.8999640684.

It can be divided in two parts, 510 and 23515, that added together give a square (24025 = 155²).

The spelling of 51023515 in words is "fifty-one million, twenty-three thousand, five hundred fifteen".