51982779 has 4 divisors (see below), whose sum is σ = 69310376. Its totient is φ = 34655184.

The previous prime is 51982759. The next prime is 51982823. The reversal of 51982779 is 97728915.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51982779 - 2⁸ = 51982523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51982709) 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, 8663794 + ... + 8663799.

It is an arithmetic number, because the mean of its divisors is an integer number (17327594).

Almost surely, 2^51982779 is an apocalyptic number.

51982779 is a deficient number, since it is larger than the sum of its proper divisors (17327597).

51982779 is a wasteful number, since it uses less digits than its factorization.

51982779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17327596.

The product of its digits is 317520, while the sum is 48.

The square root of 51982779 is about 7209.9083905414. The cubic root of 51982779 is about 373.2099075589.

The spelling of 51982779 in words is "fifty-one million, nine hundred eighty-two thousand, seven hundred seventy-nine".