125866621 has 6 divisors (see below), whose sum is σ = 132840222. Its totient is φ = 119241720.

The previous prime is 125866619. The next prime is 125866627. The reversal of 125866621 is 126668521.

It can be written as a sum of positive squares in only one way, i.e., 92064025 + 33802596 = 9595^2 + 5814^2 .

It is not a de Polignac number, because 125866621 - 2¹ = 125866619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125866627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173970 + ... + 174691.

It is an arithmetic number, because the mean of its divisors is an integer number (22140037).

Almost surely, 2^125866621 is an apocalyptic number.

It is an amenable number.

125866621 is a deficient number, since it is larger than the sum of its proper divisors (6973601).

125866621 is an equidigital number, since it uses as much as digits as its factorization.

125866621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348699 (or 348680 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 125866621 is about 11219.0294143477. The cubic root of 125866621 is about 501.1528345687.

The spelling of 125866621 in words is "one hundred twenty-five million, eight hundred sixty-six thousand, six hundred twenty-one".