131611181 has 8 divisors (see below), whose sum is σ = 143139864. Its totient is φ = 120283200.

The previous prime is 131611171. The next prime is 131611199. The reversal of 131611181 is 181116131.

It can be written as a sum of positive squares in 4 ways, for example, as 7645225 + 123965956 = 2765^2 + 11134^2 .

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 131611181 - 2¹⁸ = 131349037 is a prime.

It is a super-2 number, since 2×131611181² = 34643005928429522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131611111) 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, 48806 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (17892483).

Almost surely, 2^131611181 is an apocalyptic number.

It is an amenable number.

131611181 is a deficient number, since it is larger than the sum of its proper divisors (11528683).

131611181 is a wasteful number, since it uses less digits than its factorization.

131611181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100351.

The product of its digits is 144, while the sum is 23.

The square root of 131611181 is about 11472.1916389154. The cubic root of 131611181 is about 508.6639140624.

The spelling of 131611181 in words is "one hundred thirty-one million, six hundred eleven thousand, one hundred eighty-one".