125481281 has 4 divisors (see below), whose sum is σ = 125505492. Its totient is φ = 125457072.

The previous prime is 125481221. The next prime is 125481283. The reversal of 125481281 is 182184521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182184521 = 19 ⋅9588659.

It can be written as a sum of positive squares in 2 ways, for example, as 64000000 + 61481281 = 8000^2 + 7841^2 .

It is a cyclic number.

It is not a de Polignac number, because 125481281 - 2⁶ = 125481217 is a prime.

It is a super-2 number, since 2×125481281² = 31491103762801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125481283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830 + ... + 15863.

It is an arithmetic number, because the mean of its divisors is an integer number (31376373).

Almost surely, 2^125481281 is an apocalyptic number.

It is an amenable number.

125481281 is a deficient number, since it is larger than the sum of its proper divisors (24211).

125481281 is an equidigital number, since it uses as much as digits as its factorization.

125481281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24210.

The product of its digits is 5120, while the sum is 32.

The square root of 125481281 is about 11201.8427501907. The cubic root of 125481281 is about 500.6408861788.

The spelling of 125481281 in words is "one hundred twenty-five million, four hundred eighty-one thousand, two hundred eighty-one".