131540309 has 8 divisors (see below), whose sum is σ = 134628480. Its totient is φ = 128488096.

The previous prime is 131540267. The next prime is 131540333. The reversal of 131540309 is 903045131.

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

It is a cyclic number.

It is not a de Polignac number, because 131540309 - 2¹⁶ = 131474773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131540369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1517 + ... + 16290.

It is an arithmetic number, because the mean of its divisors is an integer number (16828560).

Almost surely, 2^131540309 is an apocalyptic number.

It is an amenable number.

131540309 is a deficient number, since it is larger than the sum of its proper divisors (3088171).

131540309 is an equidigital number, since it uses as much as digits as its factorization.

131540309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17979.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 131540309 is about 11469.1023624345. The cubic root of 131540309 is about 508.5725932959.

The spelling of 131540309 in words is "one hundred thirty-one million, five hundred forty thousand, three hundred nine".