125039681 has 4 divisors (see below), whose sum is σ = 134658132. Its totient is φ = 115421232.

The previous prime is 125039669. The next prime is 125039711. The reversal of 125039681 is 186930521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 119159056 = 2425^2 + 10916^2 .

It is a cyclic number.

It is not a de Polignac number, because 125039681 - 2⁶ = 125039617 is a prime.

It is a super-4 number, since 4×125039681⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125039581) 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, 4809206 + ... + 4809231.

It is an arithmetic number, because the mean of its divisors is an integer number (33664533).

Almost surely, 2^125039681 is an apocalyptic number.

It is an amenable number.

125039681 is a deficient number, since it is larger than the sum of its proper divisors (9618451).

125039681 is an equidigital number, since it uses as much as digits as its factorization.

125039681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9618450.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 125039681 is about 11182.1143349547. The cubic root of 125039681 is about 500.0529024025.

The spelling of 125039681 in words is "one hundred twenty-five million, thirty-nine thousand, six hundred eighty-one".