131804181 has 6 divisors (see below), whose sum is σ = 190383830. Its totient is φ = 87869448.

The previous prime is 131804177. The next prime is 131804203. The reversal of 131804181 is 181408131.

It can be written as a sum of positive squares in only one way, i.e., 85100625 + 46703556 = 9225^2 + 6834^2 .

It is not a de Polignac number, because 131804181 - 2² = 131804177 is a prime.

It is a super-2 number, since 2×131804181² = 34744684258161522, 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 (131804131) 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, 7322446 + ... + 7322463.

Almost surely, 2^131804181 is an apocalyptic number.

It is an amenable number.

131804181 is a deficient number, since it is larger than the sum of its proper divisors (58579649).

131804181 is a wasteful number, since it uses less digits than its factorization.

131804181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14644915 (or 14644912 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 131804181 is about 11480.6002020800. The cubic root of 131804181 is about 508.9124344536.

The spelling of 131804181 in words is "one hundred thirty-one million, eight hundred four thousand, one hundred eighty-one".