131181165 has 12 divisors (see below), whose sum is σ = 227380764. Its totient is φ = 69963264.

The previous prime is 131181161. The next prime is 131181179. The reversal of 131181165 is 561181131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24740676 + 106440489 = 4974^2 + 10317^2 .

It is not a de Polignac number, because 131181165 - 2² = 131181161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131181161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1457524 + ... + 1457613.

It is an arithmetic number, because the mean of its divisors is an integer number (18948397).

Almost surely, 2^131181165 is an apocalyptic number.

131181165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131181165 is a deficient number, since it is larger than the sum of its proper divisors (96199599).

131181165 is a wasteful number, since it uses less digits than its factorization.

131181165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915148 (or 2915145 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 131181165 is about 11453.4346376971. The cubic root of 131181165 is about 508.1093201499.

The spelling of 131181165 in words is "one hundred thirty-one million, one hundred eighty-one thousand, one hundred sixty-five".