505009979 has 2 divisors, whose sum is σ = 505009980. Its totient is φ = 505009978.

The previous prime is 505009951. The next prime is 505010053. The reversal of 505009979 is 979900505.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505009979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505009909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252504989 + 252504990.

It is an arithmetic number, because the mean of its divisors is an integer number (252504990).

Almost surely, 2^505009979 is an apocalyptic number.

505009979 is a deficient number, since it is larger than the sum of its proper divisors (1).

505009979 is an equidigital number, since it uses as much as digits as its factorization.

505009979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127575, while the sum is 44.

The square root of 505009979 is about 22472.4270829833. The cubic root of 505009979 is about 796.3426694587.

The spelling of 505009979 in words is "five hundred five million, nine thousand, nine hundred seventy-nine".