125441609 has 4 divisors (see below), whose sum is σ = 130895616. Its totient is φ = 119987604.

The previous prime is 125441599. The next prime is 125441647. The reversal of 125441609 is 906144521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 906144521 = 7621 ⋅118901.

It is a cyclic number.

It is not a de Polignac number, because 125441609 - 2²⁰ = 124393033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125441699) 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, 2726969 + ... + 2727014.

It is an arithmetic number, because the mean of its divisors is an integer number (32723904).

Almost surely, 2^125441609 is an apocalyptic number.

It is an amenable number.

125441609 is a deficient number, since it is larger than the sum of its proper divisors (5454007).

125441609 is an equidigital number, since it uses as much as digits as its factorization.

125441609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5454006.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 125441609 is about 11200.0718301268. The cubic root of 125441609 is about 500.5881199586.

The spelling of 125441609 in words is "one hundred twenty-five million, four hundred forty-one thousand, six hundred nine".