51768251 has 4 divisors (see below), whose sum is σ = 52031232. Its totient is φ = 51505272.

The previous prime is 51768229. The next prime is 51768263. The reversal of 51768251 is 15286715.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51768251 - 2¹⁴ = 51751867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51768271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131195 + ... + 131588.

It is an arithmetic number, because the mean of its divisors is an integer number (13007808).

Almost surely, 2^51768251 is an apocalyptic number.

51768251 is a deficient number, since it is larger than the sum of its proper divisors (262981).

51768251 is a wasteful number, since it uses less digits than its factorization.

51768251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262980.

The product of its digits is 16800, while the sum is 35.

The square root of 51768251 is about 7195.0157053338. The cubic root of 51768251 is about 372.6957990495.

The spelling of 51768251 in words is "fifty-one million, seven hundred sixty-eight thousand, two hundred fifty-one".