131712181 has 4 divisors (see below), whose sum is σ = 133016364. Its totient is φ = 130408000.

The previous prime is 131712173. The next prime is 131712187. The reversal of 131712181 is 181217131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181217131 = 2591 ⋅69941.

It can be written as a sum of positive squares in 2 ways, for example, as 80460900 + 51251281 = 8970^2 + 7159^2 .

It is a cyclic number.

It is not a de Polignac number, because 131712181 - 2³ = 131712173 is a prime.

It is a super-2 number, since 2×131712181² = 34696197247553522, 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 (131712187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651940 + ... + 652141.

It is an arithmetic number, because the mean of its divisors is an integer number (33254091).

Almost surely, 2^131712181 is an apocalyptic number.

It is an amenable number.

131712181 is a deficient number, since it is larger than the sum of its proper divisors (1304183).

131712181 is a wasteful number, since it uses less digits than its factorization.

131712181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304182.

The product of its digits is 336, while the sum is 25.

The square root of 131712181 is about 11476.5927434932. The cubic root of 131712181 is about 508.7939990561.

The spelling of 131712181 in words is "one hundred thirty-one million, seven hundred twelve thousand, one hundred eighty-one".