131309289 has 16 divisors (see below), whose sum is σ = 194711040. Its totient is φ = 87459120.

The previous prime is 131309251. The next prime is 131309329. The reversal of 131309289 is 982903131.

It is not a de Polignac number, because 131309289 - 2¹⁷ = 131178217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131309239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49384 + ... + 51974.

It is an arithmetic number, because the mean of its divisors is an integer number (12169440).

Almost surely, 2^131309289 is an apocalyptic number.

It is an amenable number.

131309289 is a deficient number, since it is larger than the sum of its proper divisors (63401751).

131309289 is a wasteful number, since it uses less digits than its factorization.

131309289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477 (or 4471 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 131309289 is about 11459.0265293349. The cubic root of 131309289 is about 508.2746889497.

The spelling of 131309289 in words is "one hundred thirty-one million, three hundred nine thousand, two hundred eighty-nine".