125255781 has 32 divisors (see below), whose sum is σ = 213734400. Its totient is φ = 71014320.

The previous prime is 125255759. The next prime is 125255783. The reversal of 125255781 is 187552521.

125255781 is a `hidden beast` number, since 1 + 2 + 525 + 57 + 81 = 666.

It is not a de Polignac number, because 125255781 - 2²² = 121061477 is a prime.

It is a super-2 number, since 2×125255781² = 31378021347839922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125255783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22230 + ... + 27288.

It is an arithmetic number, because the mean of its divisors is an integer number (6679200).

Almost surely, 2^125255781 is an apocalyptic number.

It is an amenable number.

125255781 is a deficient number, since it is larger than the sum of its proper divisors (88478619).

125255781 is a wasteful number, since it uses less digits than its factorization.

125255781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206 (or 5200 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 125255781 is about 11191.7729158521. The cubic root of 125255781 is about 500.3408089790.

The spelling of 125255781 in words is "one hundred twenty-five million, two hundred fifty-five thousand, seven hundred eighty-one".