125622809 has 24 divisors (see below), whose sum is σ = 148796760. Its totient is φ = 105283584.

The previous prime is 125622799. The next prime is 125622821. The reversal of 125622809 is 908226521.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 1968409 + 123654400 = 1403^2 + 11120^2 .

It is not a de Polignac number, because 125622809 - 2²⁴ = 108845593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125622209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108377 + ... + 109529.

It is an arithmetic number, because the mean of its divisors is an integer number (6199865).

Almost surely, 2^125622809 is an apocalyptic number.

It is an amenable number.

125622809 is a deficient number, since it is larger than the sum of its proper divisors (23173951).

125622809 is a wasteful number, since it uses less digits than its factorization.

125622809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 125622809 is about 11208.1581448515. The cubic root of 125622809 is about 500.8290366368.

The spelling of 125622809 in words is "one hundred twenty-five million, six hundred twenty-two thousand, eight hundred nine".