125578249 has 4 divisors (see below), whose sum is σ = 126821700. Its totient is φ = 124334800.

The previous prime is 125578231. The next prime is 125578261. The reversal of 125578249 is 942875521.

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 94575625 + 31002624 = 9725^2 + 5568^2 .

It is a cyclic number.

It is not a de Polignac number, because 125578249 - 2⁵ = 125578217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125578279) 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 3 ways as a sum of consecutive naturals, for example, 621574 + ... + 621775.

It is an arithmetic number, because the mean of its divisors is an integer number (31705425).

Almost surely, 2^125578249 is an apocalyptic number.

It is an amenable number.

125578249 is a deficient number, since it is larger than the sum of its proper divisors (1243451).

125578249 is a wasteful number, since it uses less digits than its factorization.

125578249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243450.

The product of its digits is 201600, while the sum is 43.

The square root of 125578249 is about 11206.1701307806. The cubic root of 125578249 is about 500.7698128348.

The spelling of 125578249 in words is "one hundred twenty-five million, five hundred seventy-eight thousand, two hundred forty-nine".