2321309981 has 2 divisors, whose sum is σ = 2321309982. Its totient is φ = 2321309980.

The previous prime is 2321309941. The next prime is 2321310001. The reversal of 2321309981 is 1899031232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2268616900 + 52693081 = 47630^2 + 7259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2321309981 - 2¹⁸ = 2321047837 is a prime.

It is a super-2 number, since 2×2321309981² = 10776960055780440722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2321309941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1160654990 + 1160654991.

It is an arithmetic number, because the mean of its divisors is an integer number (1160654991).

Almost surely, 2^2321309981 is an apocalyptic number.

It is an amenable number.

2321309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2321309981 is an equidigital number, since it uses as much as digits as its factorization.

2321309981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 2321309981 is about 48179.9748962160. The cubic root of 2321309981 is about 1324.0703066035.

The spelling of 2321309981 in words is "two billion, three hundred twenty-one million, three hundred nine thousand, nine hundred eighty-one".