125681 has 4 divisors (see below), whose sum is σ = 133092. Its totient is φ = 118272.

The previous prime is 125669. The next prime is 125683. The reversal of 125681 is 186521.

125681 = T₁₁₃ + T₁₁₄ + ... + T₁₂₉.

125681 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186521 = 383 ⋅487.

It can be written as a sum of positive squares in 2 ways, for example, as 58081 + 67600 = 241^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 125681 - 2⁶ = 125617 is a prime.

It is a super-2 number, since 2×125681² = 31591427522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 125681.

It is not an unprimeable number, because it can be changed into a prime (125683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3680 + ... + 3713.

It is an arithmetic number, because the mean of its divisors is an integer number (33273).

2¹²⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

125681 is a deficient number, since it is larger than the sum of its proper divisors (7411).

125681 is an equidigital number, since it uses as much as digits as its factorization.

125681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410.

The product of its digits is 480, while the sum is 23.

The square root of 125681 is about 354.5151618760. The cubic root of 125681 is about 50.0906356045.

The spelling of 125681 in words is "one hundred twenty-five thousand, six hundred eighty-one".