1213304979 has 4 divisors (see below), whose sum is σ = 1617739976. Its totient is φ = 808869984.

The previous prime is 1213304971. The next prime is 1213305019. The reversal of 1213304979 is 9794033121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1213304979 - 2³ = 1213304971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213304971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202217494 + ... + 202217499.

It is an arithmetic number, because the mean of its divisors is an integer number (404434994).

Almost surely, 2^1213304979 is an apocalyptic number.

1213304979 is a deficient number, since it is larger than the sum of its proper divisors (404434997).

1213304979 is an equidigital number, since it uses as much as digits as its factorization.

1213304979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404434996.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 1213304979 is about 34832.5275999316. The cubic root of 1213304979 is about 1066.5715456953.

The spelling of 1213304979 in words is "one billion, two hundred thirteen million, three hundred four thousand, nine hundred seventy-nine".