131097709 has 2 divisors, whose sum is σ = 131097710. Its totient is φ = 131097708.

The previous prime is 131097653. The next prime is 131097767. The reversal of 131097709 is 907790131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110712484 + 20385225 = 10522^2 + 4515^2 .

It is an emirp because it is prime and its reverse (907790131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131097709 - 2⁷ = 131097581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131097209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65548854 + 65548855.

It is an arithmetic number, because the mean of its divisors is an integer number (65548855).

Almost surely, 2^131097709 is an apocalyptic number.

It is an amenable number.

131097709 is a deficient number, since it is larger than the sum of its proper divisors (1).

131097709 is an equidigital number, since it uses as much as digits as its factorization.

131097709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 131097709 is about 11449.7907841148. The cubic root of 131097709 is about 508.0015461234.

The spelling of 131097709 in words is "one hundred thirty-one million, ninety-seven thousand, seven hundred nine".