125251281 has 6 divisors (see below), whose sum is σ = 180918530. Its totient is φ = 83500848.

The previous prime is 125251279. The next prime is 125251297. The reversal of 125251281 is 182152521.

It is a happy number.

125251281 is a `hidden beast` number, since 12 + 525 + 128 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 48776256 = 8745^2 + 6984^2 .

It is not a de Polignac number, because 125251281 - 2¹ = 125251279 is a prime.

It is a super-2 number, since 2×125251281² = 31375766784281922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125251241) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6958396 + ... + 6958413.

Almost surely, 2^125251281 is an apocalyptic number.

It is an amenable number.

125251281 is a deficient number, since it is larger than the sum of its proper divisors (55667249).

125251281 is a wasteful number, since it uses less digits than its factorization.

125251281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13916815 (or 13916812 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 125251281 is about 11191.5718735127. The cubic root of 125251281 is about 500.3348170783.

The spelling of 125251281 in words is "one hundred twenty-five million, two hundred fifty-one thousand, two hundred eighty-one".