131609091 has 8 divisors (see below), whose sum is σ = 175651840. Its totient is φ = 87652872.

The previous prime is 131609083. The next prime is 131609099. The reversal of 131609091 is 190906131.

It is an interprime number because it is at equal distance from previous prime (131609083) and next prime (131609099).

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

It is not a de Polignac number, because 131609091 - 2³ = 131609083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131609099) 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, 17995 + ... + 24228.

It is an arithmetic number, because the mean of its divisors is an integer number (21956480).

Almost surely, 2^131609091 is an apocalyptic number.

131609091 is a deficient number, since it is larger than the sum of its proper divisors (44042749).

131609091 is a wasteful number, since it uses less digits than its factorization.

131609091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43265.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 131609091 is about 11472.1005487225. The cubic root of 131609091 is about 508.6612215018.

The spelling of 131609091 in words is "one hundred thirty-one million, six hundred nine thousand, ninety-one".