131397609 has 8 divisors (see below), whose sum is σ = 200224960. Its totient is φ = 75084336.

The previous prime is 131397601. The next prime is 131397611. The reversal of 131397609 is 906793131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131397609 - 2³ = 131397601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131397601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3128494 + ... + 3128535.

It is an arithmetic number, because the mean of its divisors is an integer number (25028120).

Almost surely, 2^131397609 is an apocalyptic number.

It is an amenable number.

131397609 is a deficient number, since it is larger than the sum of its proper divisors (68827351).

131397609 is an equidigital number, since it uses as much as digits as its factorization.

131397609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257039.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 131397609 is about 11462.8796120347. The cubic root of 131397609 is about 508.3886203655.

The spelling of 131397609 in words is "one hundred thirty-one million, three hundred ninety-seven thousand, six hundred nine".