505578979 has 4 divisors (see below), whose sum is σ = 511670376. Its totient is φ = 499487584.

The previous prime is 505578977. The next prime is 505579003. The reversal of 505578979 is 979875505.

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 505578979 - 2¹ = 505578977 is a prime.

It is a super-2 number, since 2×505578979² = 511220208013364882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505578971) 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, 3045574 + ... + 3045739.

It is an arithmetic number, because the mean of its divisors is an integer number (127917594).

Almost surely, 2^505578979 is an apocalyptic number.

505578979 is a deficient number, since it is larger than the sum of its proper divisors (6091397).

505578979 is an equidigital number, since it uses as much as digits as its factorization.

505578979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091396.

The product of its (nonzero) digits is 3969000, while the sum is 55.

The square root of 505578979 is about 22485.0834777192. The cubic root of 505578979 is about 796.6416397274.

It can be divided in two parts, 50557 and 8979, that added together give a square (59536 = 244²).

The spelling of 505578979 in words is "five hundred five million, five hundred seventy-eight thousand, nine hundred seventy-nine".