131608289 has 4 divisors (see below), whose sum is σ = 131632560. Its totient is φ = 131584020.

The previous prime is 131608283. The next prime is 131608303. The reversal of 131608289 is 982806131.

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 a cyclic number.

It is not a de Polignac number, because 131608289 - 2²⁰ = 130559713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131608283) 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, 134 + ... + 16224.

It is an arithmetic number, because the mean of its divisors is an integer number (32908140).

Almost surely, 2^131608289 is an apocalyptic number.

It is an amenable number.

131608289 is a deficient number, since it is larger than the sum of its proper divisors (24271).

131608289 is an equidigital number, since it uses as much as digits as its factorization.

131608289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24270.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 131608289 is about 11472.0655943034. The cubic root of 131608289 is about 508.6601882725.

The spelling of 131608289 in words is "one hundred thirty-one million, six hundred eight thousand, two hundred eighty-nine".