53218979 has 4 divisors (see below), whose sum is σ = 58057080. Its totient is φ = 48380880.

The previous prime is 53218961. The next prime is 53219009. The reversal of 53218979 is 97981235.

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 53218979 - 2²⁰ = 52170403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53218939) 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, 2419034 + ... + 2419055.

It is an arithmetic number, because the mean of its divisors is an integer number (14514270).

Almost surely, 2^53218979 is an apocalyptic number.

53218979 is a deficient number, since it is larger than the sum of its proper divisors (4838101).

53218979 is a wasteful number, since it uses less digits than its factorization.

53218979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838100.

The product of its digits is 136080, while the sum is 44.

The square root of 53218979 is about 7295.1339261181. The cubic root of 53218979 is about 376.1451901749.

The spelling of 53218979 in words is "fifty-three million, two hundred eighteen thousand, nine hundred seventy-nine".