131409389 has 2 divisors, whose sum is σ = 131409390. Its totient is φ = 131409388.

The previous prime is 131409379. The next prime is 131409391. The reversal of 131409389 is 983904131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98346889 + 33062500 = 9917^2 + 5750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131409389 is a prime.

Together with 131409391, 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 (131409329) 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, 65704694 + 65704695.

It is an arithmetic number, because the mean of its divisors is an integer number (65704695).

Almost surely, 2^131409389 is an apocalyptic number.

It is an amenable number.

131409389 is a deficient number, since it is larger than the sum of its proper divisors (1).

131409389 is an equidigital number, since it uses as much as digits as its factorization.

131409389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 131409389 is about 11463.3934330110. The cubic root of 131409389 is about 508.4038125217.

The spelling of 131409389 in words is "one hundred thirty-one million, four hundred nine thousand, three hundred eighty-nine".