131274509 has 2 divisors, whose sum is σ = 131274510. Its totient is φ = 131274508.

The previous prime is 131274463. The next prime is 131274511. The reversal of 131274509 is 905472131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74874409 + 56400100 = 8653^2 + 7510^2 .

It is a cyclic number.

It is not a de Polignac number, because 131274509 - 2²⁴ = 114497293 is a prime.

Together with 131274511, 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 (131274589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65637254 + 65637255.

It is an arithmetic number, because the mean of its divisors is an integer number (65637255).

Almost surely, 2^131274509 is an apocalyptic number.

It is an amenable number.

131274509 is a deficient number, since it is larger than the sum of its proper divisors (1).

131274509 is an equidigital number, since it uses as much as digits as its factorization.

131274509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 131274509 is about 11457.5088479128. The cubic root of 131274509 is about 508.2298092746.

The spelling of 131274509 in words is "one hundred thirty-one million, two hundred seventy-four thousand, five hundred nine".