3131309 has 2 divisors, whose sum is σ = 3131310. Its totient is φ = 3131308.

The previous prime is 3131299. The next prime is 3131311. The reversal of 3131309 is 9031313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2111209 + 1020100 = 1453^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131309 - 2⁸ = 3131053 is a prime.

Together with 3131311, 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 (3131329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565654 + 1565655.

It is an arithmetic number, because the mean of its divisors is an integer number (1565655).

Almost surely, 2^3131309 is an apocalyptic number.

It is an amenable number.

3131309 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131309 is an equidigital number, since it uses as much as digits as its factorization.

3131309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 3131309 is about 1769.5505078974. The cubic root of 3131309 is about 146.2992081229.

The spelling of 3131309 in words is "three million, one hundred thirty-one thousand, three hundred nine".