125964809 has 2 divisors, whose sum is σ = 125964810. Its totient is φ = 125964808.

The previous prime is 125964799. The next prime is 125964847. The reversal of 125964809 is 908469521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67289209 + 58675600 = 8203^2 + 7660^2 .

It is a cyclic number.

It is not a de Polignac number, because 125964809 - 2¹⁶ = 125899273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125964809.

It is not a weakly prime, because it can be changed into another prime (125964109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62982404 + 62982405.

It is an arithmetic number, because the mean of its divisors is an integer number (62982405).

Almost surely, 2^125964809 is an apocalyptic number.

It is an amenable number.

125964809 is a deficient number, since it is larger than the sum of its proper divisors (1).

125964809 is an equidigital number, since it uses as much as digits as its factorization.

125964809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 125964809 is about 11223.4045191288. The cubic root of 125964809 is about 501.2831164079.

The spelling of 125964809 in words is "one hundred twenty-five million, nine hundred sixty-four thousand, eight hundred nine".