125208009 has 12 divisors (see below), whose sum is σ = 191494836. Its totient is φ = 78561792.

The previous prime is 125208007. The next prime is 125208011. The reversal of 125208009 is 900802521.

It is an interprime number because it is at equal distance from previous prime (125208007) and next prime (125208011).

It can be written as a sum of positive squares in 2 ways, for example, as 50765625 + 74442384 = 7125^2 + 8628^2 .

It is not a de Polignac number, because 125208009 - 2¹ = 125208007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125208007) 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, 409024 + ... + 409329.

It is an arithmetic number, because the mean of its divisors is an integer number (15957903).

Almost surely, 2^125208009 is an apocalyptic number.

It is an amenable number.

125208009 is a deficient number, since it is larger than the sum of its proper divisors (66286827).

125208009 is a wasteful number, since it uses less digits than its factorization.

125208009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818376 (or 818373 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 125208009 is about 11189.6384660095. The cubic root of 125208009 is about 500.2771916345.

The spelling of 125208009 in words is "one hundred twenty-five million, two hundred eight thousand, nine".