520206979 has 4 divisors (see below), whose sum is σ = 527333176. Its totient is φ = 513080784.

The previous prime is 520206971. The next prime is 520207003. The reversal of 520206979 is 979602025.

It is a happy number.

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 520206979 - 2³ = 520206971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520206971) 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, 3562989 + ... + 3563134.

It is an arithmetic number, because the mean of its divisors is an integer number (131833294).

Almost surely, 2^520206979 is an apocalyptic number.

520206979 is a deficient number, since it is larger than the sum of its proper divisors (7126197).

520206979 is an equidigital number, since it uses as much as digits as its factorization.

520206979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126196.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 520206979 is about 22808.0463652633. The cubic root of 520206979 is about 804.2518306159.

The spelling of 520206979 in words is "five hundred twenty million, two hundred six thousand, nine hundred seventy-nine".