131897309 has 2 divisors, whose sum is σ = 131897310. Its totient is φ = 131897308.

The previous prime is 131897291. The next prime is 131897317. The reversal of 131897309 is 903798131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69139225 + 62758084 = 8315^2 + 7922^2 .

It is a cyclic number.

It is not a de Polignac number, because 131897309 - 2²⁰ = 130848733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131897009) 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, 65948654 + 65948655.

It is an arithmetic number, because the mean of its divisors is an integer number (65948655).

Almost surely, 2^131897309 is an apocalyptic number.

It is an amenable number.

131897309 is a deficient number, since it is larger than the sum of its proper divisors (1).

131897309 is an equidigital number, since it uses as much as digits as its factorization.

131897309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 131897309 is about 11484.6553714075. The cubic root of 131897309 is about 509.0322658554.

The spelling of 131897309 in words is "one hundred thirty-one million, eight hundred ninety-seven thousand, three hundred nine".