125863909 has 2 divisors, whose sum is σ = 125863910. Its totient is φ = 125863908.

The previous prime is 125863897. The next prime is 125863921. The reversal of 125863909 is 909368521.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (125863897) and next prime (125863921).

It can be written as a sum of positive squares in only one way, i.e., 125664100 + 199809 = 11210^2 + 447^2 .

It is an emirp because it is prime and its reverse (909368521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125863909 - 2⁷ = 125863781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125860909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62931954 + 62931955.

It is an arithmetic number, because the mean of its divisors is an integer number (62931955).

Almost surely, 2^125863909 is an apocalyptic number.

It is an amenable number.

125863909 is a deficient number, since it is larger than the sum of its proper divisors (1).

125863909 is an equidigital number, since it uses as much as digits as its factorization.

125863909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 125863909 is about 11218.9085476262. The cubic root of 125863909 is about 501.1492351600.

The spelling of 125863909 in words is "one hundred twenty-five million, eight hundred sixty-three thousand, nine hundred nine".