124985809 has 12 divisors (see below), whose sum is σ = 135824796. Its totient is φ = 114958272.

The previous prime is 124985807. The next prime is 124985837. The reversal of 124985809 is 908589421.

It can be written as a sum of positive squares in 6 ways, for example, as 57335184 + 67650625 = 7572^2 + 8225^2 .

It is not a de Polignac number, because 124985809 - 2¹ = 124985807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124985803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52407 + ... + 54739.

It is an arithmetic number, because the mean of its divisors is an integer number (11318733).

Almost surely, 2^124985809 is an apocalyptic number.

It is an amenable number.

124985809 is a deficient number, since it is larger than the sum of its proper divisors (10838987).

124985809 is a wasteful number, since it uses less digits than its factorization.

124985809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676 (or 2663 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 124985809 is about 11179.7052286722. The cubic root of 124985809 is about 499.9810779506.

The spelling of 124985809 in words is "one hundred twenty-four million, nine hundred eighty-five thousand, eight hundred nine".