131165550 has 216 divisors, whose sum is σ = 401146200. Its totient is φ = 30602880.

The previous prime is 131165549. The next prime is 131165623. The reversal of 131165550 is 55561131.

131165550 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 655 + 5 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 4522936 + ... + 4522964.

Almost surely, 2^131165550 is an apocalyptic number.

131165550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 131165550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200573100).

131165550 is an abundant number, since it is smaller than the sum of its proper divisors (269980650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131165550 is a wasteful number, since it uses less digits than its factorization.

131165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 131165550 is about 11452.7529441615. The cubic root of 131165550 is about 508.0891586126.

The spelling of 131165550 in words is "one hundred thirty-one million, one hundred sixty-five thousand, five hundred fifty".