131097409 has 2 divisors, whose sum is σ = 131097410. Its totient is φ = 131097408.

The previous prime is 131097389. The next prime is 131097413. The reversal of 131097409 is 904790131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106812225 + 24285184 = 10335^2 + 4928^2 .

It is a cyclic number.

It is not a de Polignac number, because 131097409 - 2²¹ = 129000257 is a prime.

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, 65548704 + 65548705.

It is an arithmetic number, because the mean of its divisors is an integer number (65548705).

Almost surely, 2^131097409 is an apocalyptic number.

It is an amenable number.

131097409 is a deficient number, since it is larger than the sum of its proper divisors (1).

131097409 is an equidigital number, since it uses as much as digits as its factorization.

131097409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 131097409 is about 11449.7776834312. Note that the first 3 decimals coincide. The cubic root of 131097409 is about 508.0011586247.

The spelling of 131097409 in words is "one hundred thirty-one million, ninety-seven thousand, four hundred nine".