131545409 has 2 divisors, whose sum is σ = 131545410. Its totient is φ = 131545408.

The previous prime is 131545391. The next prime is 131545459. The reversal of 131545409 is 904545131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93993025 + 37552384 = 9695^2 + 6128^2 .

It is a cyclic number.

It is not a de Polignac number, because 131545409 - 2²⁴ = 114768193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131545459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65772704 + 65772705.

It is an arithmetic number, because the mean of its divisors is an integer number (65772705).

Almost surely, 2^131545409 is an apocalyptic number.

It is an amenable number.

131545409 is a deficient number, since it is larger than the sum of its proper divisors (1).

131545409 is an equidigital number, since it uses as much as digits as its factorization.

131545409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 131545409 is about 11469.3246967727. The cubic root of 131545409 is about 508.5791658989.

The spelling of 131545409 in words is "one hundred thirty-one million, five hundred forty-five thousand, four hundred nine".