125388661 has 4 divisors (see below), whose sum is σ = 125429472. Its totient is φ = 125347852.

The previous prime is 125388647. The next prime is 125388667. The reversal of 125388661 is 166883521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125388661 - 2²⁵ = 91834229 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125388667) 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 3 ways as a sum of consecutive naturals, for example, 15385 + ... + 22078.

It is an arithmetic number, because the mean of its divisors is an integer number (31357368).

Almost surely, 2^125388661 is an apocalyptic number.

It is an amenable number.

125388661 is a deficient number, since it is larger than the sum of its proper divisors (40811).

125388661 is an equidigital number, since it uses as much as digits as its factorization.

125388661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40810.

The product of its digits is 69120, while the sum is 40.

The square root of 125388661 is about 11197.7078458049. The cubic root of 125388661 is about 500.5176784996.

The spelling of 125388661 in words is "one hundred twenty-five million, three hundred eighty-eight thousand, six hundred sixty-one".