125840257 has 2 divisors, whose sum is σ = 125840258. Its totient is φ = 125840256.

The previous prime is 125840227. The next prime is 125840311. The reversal of 125840257 is 752048521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86099841 + 39740416 = 9279^2 + 6304^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125840257 is a prime.

It is not a weakly prime, because it can be changed into another prime (125840207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62920128 + 62920129.

It is an arithmetic number, because the mean of its divisors is an integer number (62920129).

Almost surely, 2^125840257 is an apocalyptic number.

It is an amenable number.

125840257 is a deficient number, since it is larger than the sum of its proper divisors (1).

125840257 is an equidigital number, since it uses as much as digits as its factorization.

125840257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 125840257 is about 11217.8543848634. The cubic root of 125840257 is about 501.1178416643.

Adding to 125840257 its reverse (752048521), we get a palindrome (877888778).

The spelling of 125840257 in words is "one hundred twenty-five million, eight hundred forty thousand, two hundred fifty-seven".