51292251 has 32 divisors (see below), whose sum is σ = 77952000. Its totient is φ = 33325344.

The previous prime is 51292237. The next prime is 51292253. The reversal of 51292251 is 15229215.

51292251 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 51292251 - 2⁶ = 51292187 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (51292253) 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 31 ways as a sum of consecutive naturals, for example, 296401 + ... + 296573.

It is an arithmetic number, because the mean of its divisors is an integer number (2436000).

Almost surely, 2^51292251 is an apocalyptic number.

51292251 is a deficient number, since it is larger than the sum of its proper divisors (26659749).

51292251 is a wasteful number, since it uses less digits than its factorization.

51292251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 394 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51292251 is about 7161.8608615359. The cubic root of 51292251 is about 371.5499891370.

The spelling of 51292251 in words is "fifty-one million, two hundred ninety-two thousand, two hundred fifty-one".