51943979 has 4 divisors (see below), whose sum is σ = 52064376. Its totient is φ = 51823584.

The previous prime is 51943963. The next prime is 51943981. The reversal of 51943979 is 97934915.

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 51943979 - 2⁴ = 51943963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51943939) 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, 59549 + ... + 60414.

It is an arithmetic number, because the mean of its divisors is an integer number (13016094).

Almost surely, 2^51943979 is an apocalyptic number.

51943979 is a deficient number, since it is larger than the sum of its proper divisors (120397).

51943979 is a wasteful number, since it uses less digits than its factorization.

51943979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120396.

The product of its digits is 306180, while the sum is 47.

The square root of 51943979 is about 7207.2171467217. The cubic root of 51943979 is about 373.1170296934.

The spelling of 51943979 in words is "fifty-one million, nine hundred forty-three thousand, nine hundred seventy-nine".