51257879 has 4 divisors (see below), whose sum is σ = 51457584. Its totient is φ = 51058176.

The previous prime is 51257867. The next prime is 51257887. The reversal of 51257879 is 97875215.

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 51257879 - 2⁴ = 51257863 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51257279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99467 + ... + 99980.

It is an arithmetic number, because the mean of its divisors is an integer number (12864396).

Almost surely, 2^51257879 is an apocalyptic number.

51257879 is a deficient number, since it is larger than the sum of its proper divisors (199705).

51257879 is a wasteful number, since it uses less digits than its factorization.

51257879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199704.

The product of its digits is 176400, while the sum is 44.

The square root of 51257879 is about 7159.4608037198. The cubic root of 51257879 is about 371.4669761430.

The spelling of 51257879 in words is "fifty-one million, two hundred fifty-seven thousand, eight hundred seventy-nine".