131899181 has 4 divisors (see below), whose sum is σ = 137633952. Its totient is φ = 126164412.

The previous prime is 131899177. The next prime is 131899199. The reversal of 131899181 is 181998131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131899181 - 2² = 131899177 is a prime.

It is a super-2 number, since 2×131899181² = 34794787896941522, 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 (131899151) 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, 2867351 + ... + 2867396.

It is an arithmetic number, because the mean of its divisors is an integer number (34408488).

Almost surely, 2^131899181 is an apocalyptic number.

It is an amenable number.

131899181 is a deficient number, since it is larger than the sum of its proper divisors (5734771).

131899181 is an equidigital number, since it uses as much as digits as its factorization.

131899181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734770.

The product of its digits is 15552, while the sum is 41.

The square root of 131899181 is about 11484.7368711695. The cubic root of 131899181 is about 509.0346740518.

The spelling of 131899181 in words is "one hundred thirty-one million, eight hundred ninety-nine thousand, one hundred eighty-one".