2031320309 has 2 divisors, whose sum is σ = 2031320310. Its totient is φ = 2031320308.

The previous prime is 2031320273. The next prime is 2031320311. The reversal of 2031320309 is 9030231302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1546219684 + 485100625 = 39322^2 + 22025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031320309 is a prime.

Together with 2031320311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2031320209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015660154 + 1015660155.

It is an arithmetic number, because the mean of its divisors is an integer number (1015660155).

Almost surely, 2^2031320309 is an apocalyptic number.

It is an amenable number.

2031320309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031320309 is an equidigital number, since it uses as much as digits as its factorization.

2031320309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 2031320309 is about 45070.1709448722. The cubic root of 2031320309 is about 1266.4638667553.

The spelling of 2031320309 in words is "two billion, thirty-one million, three hundred twenty thousand, three hundred nine".