51919979 has 4 divisors (see below), whose sum is σ = 51954600. Its totient is φ = 51885360.

The previous prime is 51919961. The next prime is 51919999. The reversal of 51919979 is 97991915.

51919979 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.

It is a cyclic number.

It is not a de Polignac number, because 51919979 - 2¹² = 51915883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51919909) 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, 14954 + ... + 18095.

It is an arithmetic number, because the mean of its divisors is an integer number (12988650).

Almost surely, 2^51919979 is an apocalyptic number.

51919979 is a deficient number, since it is larger than the sum of its proper divisors (34621).

51919979 is a wasteful number, since it uses less digits than its factorization.

51919979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34620.

The product of its digits is 229635, while the sum is 50.

The square root of 51919979 is about 7205.5519566512. The cubic root of 51919979 is about 373.0595563128.

The spelling of 51919979 in words is "fifty-one million, nine hundred nineteen thousand, nine hundred seventy-nine".