125724517 has 2 divisors, whose sum is σ = 125724518. Its totient is φ = 125724516.

The previous prime is 125724451. The next prime is 125724551. The reversal of 125724517 is 715427521.

It is an a-pointer prime, because the next prime (125724551) can be obtained adding 125724517 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125417601 + 306916 = 11199^2 + 554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125724517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125724587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62862258 + 62862259.

It is an arithmetic number, because the mean of its divisors is an integer number (62862259).

Almost surely, 2^125724517 is an apocalyptic number.

It is an amenable number.

125724517 is a deficient number, since it is larger than the sum of its proper divisors (1).

125724517 is an equidigital number, since it uses as much as digits as its factorization.

125724517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19600, while the sum is 34.

The square root of 125724517 is about 11212.6944576226. The cubic root of 125724517 is about 500.9641622539.

The spelling of 125724517 in words is "one hundred twenty-five million, seven hundred twenty-four thousand, five hundred seventeen".