131837309 has 2 divisors, whose sum is σ = 131837310. Its totient is φ = 131837308.

The previous prime is 131837291. The next prime is 131837339. The reversal of 131837309 is 903738131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127193284 + 4644025 = 11278^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 131837309 - 2⁸ = 131837053 is a prime.

It is a super-2 number, since 2×131837309² = 34762152088722962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131837339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65918654 + 65918655.

It is an arithmetic number, because the mean of its divisors is an integer number (65918655).

Almost surely, 2^131837309 is an apocalyptic number.

It is an amenable number.

131837309 is a deficient number, since it is larger than the sum of its proper divisors (1).

131837309 is an equidigital number, since it uses as much as digits as its factorization.

131837309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 131837309 is about 11482.0428931441. The cubic root of 131837309 is about 508.9550679997.

The spelling of 131837309 in words is "one hundred thirty-one million, eight hundred thirty-seven thousand, three hundred nine".