131286181 has 32 divisors (see below), whose sum is σ = 156119040. Its totient is φ = 109335744.

The previous prime is 131286179. The next prime is 131286187. The reversal of 131286181 is 181682131.

It is a cyclic number.

It is not a de Polignac number, because 131286181 - 2¹ = 131286179 is a prime.

It is a super-2 number, since 2×131286181² = 34472122643129522, 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 (131286187) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499056 + ... + 499318.

It is an arithmetic number, because the mean of its divisors is an integer number (4878720).

Almost surely, 2^131286181 is an apocalyptic number.

It is an amenable number.

131286181 is a deficient number, since it is larger than the sum of its proper divisors (24832859).

131286181 is a wasteful number, since it uses less digits than its factorization.

131286181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385.

The product of its digits is 2304, while the sum is 31.

The square root of 131286181 is about 11458.0181968786. The cubic root of 131286181 is about 508.2448715604.

The spelling of 131286181 in words is "one hundred thirty-one million, two hundred eighty-six thousand, one hundred eighty-one".