2031131309 has 2 divisors, whose sum is σ = 2031131310. Its totient is φ = 2031131308.

The previous prime is 2031131303. The next prime is 2031131327. The reversal of 2031131309 is 9031311302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988268100 + 42863209 = 44590^2 + 6547^2 .

It is a cyclic number.

It is not a de Polignac number, because 2031131309 - 2¹² = 2031127213 is a prime.

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 (2031131303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1015565654 + 1015565655.

It is an arithmetic number, because the mean of its divisors is an integer number (1015565655).

Almost surely, 2^2031131309 is an apocalyptic number.

It is an amenable number.

2031131309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2031131309 is an equidigital number, since it uses as much as digits as its factorization.

2031131309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 2031131309 is about 45068.0741656441. The cubic root of 2031131309 is about 1266.4245870326.

The spelling of 2031131309 in words is "two billion, thirty-one million, one hundred thirty-one thousand, three hundred nine".