131142181 has 2 divisors, whose sum is σ = 131142182. Its totient is φ = 131142180.

The previous prime is 131142163. The next prime is 131142211. The reversal of 131142181 is 181241131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111197025 + 19945156 = 10545^2 + 4466^2 .

It is a cyclic number.

It is not a de Polignac number, because 131142181 - 2⁹ = 131141669 is a prime.

It is a super-2 number, since 2×131142181² = 34396543274873522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131122181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65571090 + 65571091.

It is an arithmetic number, because the mean of its divisors is an integer number (65571091).

Almost surely, 2^131142181 is an apocalyptic number.

It is an amenable number.

131142181 is a deficient number, since it is larger than the sum of its proper divisors (1).

131142181 is an equidigital number, since it uses as much as digits as its factorization.

131142181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

The square root of 131142181 is about 11451.7326636627. The cubic root of 131142181 is about 508.0589823944.

The spelling of 131142181 in words is "one hundred thirty-one million, one hundred forty-two thousand, one hundred eighty-one".