125855181 has 8 divisors (see below), whose sum is σ = 186452160. Its totient is φ = 83903436.

The previous prime is 125855159. The next prime is 125855189. The reversal of 125855181 is 181558521.

125855181 is a `hidden beast` number, since 1 + 25 + 8 + 551 + 81 = 666.

It is not a de Polignac number, because 125855181 - 2¹⁵ = 125822413 is a prime.

It is a super-2 number, since 2×125855181² = 31679053169085522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125855189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2330625 + ... + 2330678.

It is an arithmetic number, because the mean of its divisors is an integer number (23306520).

Almost surely, 2^125855181 is an apocalyptic number.

It is an amenable number.

125855181 is a deficient number, since it is larger than the sum of its proper divisors (60596979).

125855181 is an equidigital number, since it uses as much as digits as its factorization.

125855181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661312 (or 4661306 counting only the distinct ones).

The product of its digits is 16000, while the sum is 36.

The square root of 125855181 is about 11218.5195547363. The cubic root of 125855181 is about 501.1376508711.

It can be divided in two parts, 12585 and 5181, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 125855181 in words is "one hundred twenty-five million, eight hundred fifty-five thousand, one hundred eighty-one".