131609911 has 6 divisors (see below), whose sum is σ = 135993336. Its totient is φ = 127363500.

The previous prime is 131609899. The next prime is 131609921. The reversal of 131609911 is 119906131.

It is not a de Polignac number, because 131609911 - 2⁷ = 131609783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131609921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67515 + ... + 69436.

It is an arithmetic number, because the mean of its divisors is an integer number (22665556).

Almost surely, 2^131609911 is an apocalyptic number.

131609911 is a deficient number, since it is larger than the sum of its proper divisors (4383425).

131609911 is an equidigital number, since it uses as much as digits as its factorization.

131609911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137013 (or 136982 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 131609911 is about 11472.1362875447. The cubic root of 131609911 is about 508.6622779166.

The spelling of 131609911 in words is "one hundred thirty-one million, six hundred nine thousand, nine hundred eleven".