125973649 has 2 divisors, whose sum is σ = 125973650. Its totient is φ = 125973648.

The previous prime is 125973623. The next prime is 125973671. The reversal of 125973649 is 946379521.

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., 100400400 + 25573249 = 10020^2 + 5057^2 .

It is a cyclic number.

It is not a de Polignac number, because 125973649 - 2⁷ = 125973521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125973599 and 125973608.

It is not a weakly prime, because it can be changed into another prime (125973149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62986824 + 62986825.

It is an arithmetic number, because the mean of its divisors is an integer number (62986825).

Almost surely, 2^125973649 is an apocalyptic number.

It is an amenable number.

125973649 is a deficient number, since it is larger than the sum of its proper divisors (1).

125973649 is an equidigital number, since it uses as much as digits as its factorization.

125973649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 125973649 is about 11223.7983321156. The cubic root of 125973649 is about 501.2948425377.

The spelling of 125973649 in words is "one hundred twenty-five million, nine hundred seventy-three thousand, six hundred forty-nine".