2311021309 has 2 divisors, whose sum is σ = 2311021310. Its totient is φ = 2311021308.

The previous prime is 2311021303. The next prime is 2311021313. The reversal of 2311021309 is 9031201132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2242496025 + 68525284 = 47355^2 + 8278^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311021309 - 2⁵ = 2311021277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2311021309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311021303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155510654 + 1155510655.

It is an arithmetic number, because the mean of its divisors is an integer number (1155510655).

Almost surely, 2^2311021309 is an apocalyptic number.

It is an amenable number.

2311021309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311021309 is an equidigital number, since it uses as much as digits as its factorization.

2311021309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2311021309 is about 48073.0829987011. The cubic root of 2311021309 is about 1322.1111970585. Note that the first 4 decimals are identical.

The spelling of 2311021309 in words is "two billion, three hundred eleven million, twenty-one thousand, three hundred nine".