125913749 has 8 divisors (see below), whose sum is σ = 135850680. Its totient is φ = 116012736.

The previous prime is 125913731. The next prime is 125913763. The reversal of 125913749 is 947319521.

It can be written as a sum of positive squares in 4 ways, for example, as 70225 + 125843524 = 265^2 + 11218^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125913749 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 (125913719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454 + ... + 15935.

It is an arithmetic number, because the mean of its divisors is an integer number (16981335).

Almost surely, 2^125913749 is an apocalyptic number.

It is an amenable number.

125913749 is a deficient number, since it is larger than the sum of its proper divisors (9936931).

125913749 is a wasteful number, since it uses less digits than its factorization.

125913749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17959.

The product of its digits is 68040, while the sum is 41.

The square root of 125913749 is about 11221.1295777208. The cubic root of 125913749 is about 501.2153753319.

The spelling of 125913749 in words is "one hundred twenty-five million, nine hundred thirteen thousand, seven hundred forty-nine".