125917549 has 4 divisors (see below), whose sum is σ = 129320764. Its totient is φ = 122514336.

The previous prime is 125917523. The next prime is 125917573. The reversal of 125917549 is 945719521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 945719521 = 2341 ⋅403981.

It can be written as a sum of positive squares in 2 ways, for example, as 103164649 + 22752900 = 10157^2 + 4770^2 .

It is a cyclic number.

It is not a de Polignac number, because 125917549 - 2⁹ = 125917037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125917849) 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, 1701552 + ... + 1701625.

It is an arithmetic number, because the mean of its divisors is an integer number (32330191).

Almost surely, 2^125917549 is an apocalyptic number.

It is an amenable number.

125917549 is a deficient number, since it is larger than the sum of its proper divisors (3403215).

125917549 is an equidigital number, since it uses as much as digits as its factorization.

125917549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3403214.

The product of its digits is 113400, while the sum is 43.

The square root of 125917549 is about 11221.2988998600. The cubic root of 125917549 is about 501.2204174058.

The spelling of 125917549 in words is "one hundred twenty-five million, nine hundred seventeen thousand, five hundred forty-nine".