131165409 has 4 divisors (see below), whose sum is σ = 174887216. Its totient is φ = 87443604.

The previous prime is 131165401. The next prime is 131165413. The reversal of 131165409 is 904561131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131165409 - 2³ = 131165401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131165401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21860899 + ... + 21860904.

It is an arithmetic number, because the mean of its divisors is an integer number (43721804).

Almost surely, 2^131165409 is an apocalyptic number.

It is an amenable number.

131165409 is a deficient number, since it is larger than the sum of its proper divisors (43721807).

131165409 is an equidigital number, since it uses as much as digits as its factorization.

131165409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43721806.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 131165409 is about 11452.7467884346. The cubic root of 131165409 is about 508.0889765511.

The spelling of 131165409 in words is "one hundred thirty-one million, one hundred sixty-five thousand, four hundred nine".