125643621 has 8 divisors (see below), whose sum is σ = 167587200. Its totient is φ = 83731232.

The previous prime is 125643613. The next prime is 125643647. The reversal of 125643621 is 126346521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125643621 - 2³ = 125643613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125643671) 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 7 ways as a sum of consecutive naturals, for example, 4276 + ... + 16418.

It is an arithmetic number, because the mean of its divisors is an integer number (20948400).

Almost surely, 2^125643621 is an apocalyptic number.

It is an amenable number.

125643621 is a deficient number, since it is larger than the sum of its proper divisors (41943579).

125643621 is a wasteful number, since it uses less digits than its factorization.

125643621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15595.

The product of its digits is 8640, while the sum is 30.

The square root of 125643621 is about 11209.0865372697. The cubic root of 125643621 is about 500.8566926504.

The spelling of 125643621 in words is "one hundred twenty-five million, six hundred forty-three thousand, six hundred twenty-one".