51522979 has 4 divisors (see below), whose sum is σ = 52367680. Its totient is φ = 50678280.

The previous prime is 51522973. The next prime is 51522983. The reversal of 51522979 is 97922515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97922515 = 5 ⋅19584503.

It is a cyclic number.

It is not a de Polignac number, because 51522979 - 2¹⁵ = 51490211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51522973) 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, 422259 + ... + 422380.

It is an arithmetic number, because the mean of its divisors is an integer number (13091920).

Almost surely, 2^51522979 is an apocalyptic number.

51522979 is a deficient number, since it is larger than the sum of its proper divisors (844701).

51522979 is an equidigital number, since it uses as much as digits as its factorization.

51522979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844700.

The product of its digits is 56700, while the sum is 40.

The square root of 51522979 is about 7177.9508914453. The cubic root of 51522979 is about 372.1062704632.

The spelling of 51522979 in words is "fifty-one million, five hundred twenty-two thousand, nine hundred seventy-nine".