2318679721 has 2 divisors, whose sum is σ = 2318679722. Its totient is φ = 2318679720.

The previous prime is 2318679679. The next prime is 2318679733. The reversal of 2318679721 is 1279768132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2269188496 + 49491225 = 47636^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2318679721 - 2¹³ = 2318671529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2318679791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1159339860 + 1159339861.

It is an arithmetic number, because the mean of its divisors is an integer number (1159339861).

Almost surely, 2^2318679721 is an apocalyptic number.

It is an amenable number.

2318679721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2318679721 is an equidigital number, since it uses as much as digits as its factorization.

2318679721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 2318679721 is about 48152.6709643401. The cubic root of 2318679721 is about 1323.5700193505.

The spelling of 2318679721 in words is "two billion, three hundred eighteen million, six hundred seventy-nine thousand, seven hundred twenty-one".