51978959 has 4 divisors (see below), whose sum is σ = 53187816. Its totient is φ = 50770104.

The previous prime is 51978947. The next prime is 51978961. The reversal of 51978959 is 95987915.

51978959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95987915 = 5 ⋅19197583.

It is a cyclic number.

It is not a de Polignac number, because 51978959 - 2²⁴ = 35201743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51978959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51978929) 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 3 ways as a sum of consecutive naturals, for example, 604364 + ... + 604449.

It is an arithmetic number, because the mean of its divisors is an integer number (13296954).

Almost surely, 2^51978959 is an apocalyptic number.

51978959 is a deficient number, since it is larger than the sum of its proper divisors (1208857).

51978959 is a wasteful number, since it uses less digits than its factorization.

51978959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208856.

The product of its digits is 1020600, while the sum is 53.

The square root of 51978959 is about 7209.6434724610. The cubic root of 51978959 is about 373.2007654494.

The spelling of 51978959 in words is "fifty-one million, nine hundred seventy-eight thousand, nine hundred fifty-nine".