131401409 has 2 divisors, whose sum is σ = 131401410. Its totient is φ = 131401408.

The previous prime is 131401399. The next prime is 131401429. The reversal of 131401409 is 904104131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112954384 + 18447025 = 10628^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 131401409 - 2¹⁶ = 131335873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131401429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65700704 + 65700705.

It is an arithmetic number, because the mean of its divisors is an integer number (65700705).

Almost surely, 2^131401409 is an apocalyptic number.

It is an amenable number.

131401409 is a deficient number, since it is larger than the sum of its proper divisors (1).

131401409 is an equidigital number, since it uses as much as digits as its factorization.

131401409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 131401409 is about 11463.0453632532. The cubic root of 131401409 is about 508.3935211602.

The spelling of 131401409 in words is "one hundred thirty-one million, four hundred one thousand, four hundred nine".