125444521 has 4 divisors (see below), whose sum is σ = 126854100. Its totient is φ = 124034944.

The previous prime is 125444497. The next prime is 125444537.

125444521 is nontrivially palindromic in base 10.

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 80353296 + 45091225 = 8964^2 + 6715^2 .

It is a cyclic number.

It is not a de Polignac number, because 125444521 - 2⁵ = 125444489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125444521.

It is not an unprimeable number, because it can be changed into a prime (125444591) 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, 704656 + ... + 704833.

It is an arithmetic number, because the mean of its divisors is an integer number (31713525).

Almost surely, 2^125444521 is an apocalyptic number.

It is an amenable number.

125444521 is a deficient number, since it is larger than the sum of its proper divisors (1409579).

125444521 is an equidigital number, since it uses as much as digits as its factorization.

125444521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409578.

The product of its digits is 6400, while the sum is 28.

The square root of 125444521 is about 11200.2018285386. The cubic root of 125444521 is about 500.5919934775.

The spelling of 125444521 in words is "one hundred twenty-five million, four hundred forty-four thousand, five hundred twenty-one".