131919409 has 2 divisors, whose sum is σ = 131919410. Its totient is φ = 131919408.

The previous prime is 131919397. The next prime is 131919499. The reversal of 131919409 is 904919131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127757809 + 4161600 = 11303^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 131919409 - 2⁵ = 131919377 is a prime.

It is not a weakly prime, because it can be changed into another prime (131919499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65959704 + 65959705.

It is an arithmetic number, because the mean of its divisors is an integer number (65959705).

Almost surely, 2^131919409 is an apocalyptic number.

It is an amenable number.

131919409 is a deficient number, since it is larger than the sum of its proper divisors (1).

131919409 is an equidigital number, since it uses as much as digits as its factorization.

131919409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 131919409 is about 11485.6174844890. The cubic root of 131919409 is about 509.0606944991.

The spelling of 131919409 in words is "one hundred thirty-one million, nine hundred nineteen thousand, four hundred nine".