125808649 has 2 divisors, whose sum is σ = 125808650. Its totient is φ = 125808648.

The previous prime is 125808611. The next prime is 125808659. The reversal of 125808649 is 946808521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78198649 + 47610000 = 8843^2 + 6900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125808649 is a prime.

It is not a weakly prime, because it can be changed into another prime (125808659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62904324 + 62904325.

It is an arithmetic number, because the mean of its divisors is an integer number (62904325).

Almost surely, 2^125808649 is an apocalyptic number.

It is an amenable number.

125808649 is a deficient number, since it is larger than the sum of its proper divisors (1).

125808649 is an equidigital number, since it uses as much as digits as its factorization.

125808649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 125808649 is about 11216.4454708254. The cubic root of 125808649 is about 501.0758819622.

The spelling of 125808649 in words is "one hundred twenty-five million, eight hundred eight thousand, six hundred forty-nine".