51145815 has 64 divisors (see below), whose sum is σ = 101744640. Its totient is φ = 21409920.

The previous prime is 51145811. The next prime is 51145841. The reversal of 51145815 is 51854115.

51145815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51145815 - 2² = 51145811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145811) 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 63 ways as a sum of consecutive naturals, for example, 61432 + ... + 62258.

It is an arithmetic number, because the mean of its divisors is an integer number (1589760).

Almost surely, 2^51145815 is an apocalyptic number.

51145815 is a deficient number, since it is larger than the sum of its proper divisors (50598825).

51145815 is a wasteful number, since it uses less digits than its factorization.

51145815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 4000, while the sum is 30.

The square root of 51145815 is about 7151.6302337299. The cubic root of 51145815 is about 371.1960685298.

The spelling of 51145815 in words is "fifty-one million, one hundred forty-five thousand, eight hundred fifteen".