51136979 has 4 divisors (see below), whose sum is σ = 51155376. Its totient is φ = 51118584.

The previous prime is 51136951. The next prime is 51136991. The reversal of 51136979 is 97963115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97963115 = 5 ⋅19592623.

It is a cyclic number.

It is not a de Polignac number, because 51136979 - 2²⁰ = 50088403 is a prime.

It is a super-2 number, since 2×51136979² = 5229981242492882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51136909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4079 + ... + 10904.

It is an arithmetic number, because the mean of its divisors is an integer number (12788844).

Almost surely, 2^51136979 is an apocalyptic number.

51136979 is a deficient number, since it is larger than the sum of its proper divisors (18397).

51136979 is a wasteful number, since it uses less digits than its factorization.

51136979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18396.

The product of its digits is 51030, while the sum is 41.

The square root of 51136979 is about 7151.0124458009. The cubic root of 51136979 is about 371.1746912359.

The spelling of 51136979 in words is "fifty-one million, one hundred thirty-six thousand, nine hundred seventy-nine".