115899809 has 8 divisors (see below), whose sum is σ = 117249000. Its totient is φ = 114556032.

The previous prime is 115899803. The next prime is 115899841. The reversal of 115899809 is 908998511.

It can be written as a sum of positive squares in 4 ways, for example, as 68840209 + 47059600 = 8297^2 + 6860^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 115899809 - 2¹² = 115895713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (115899803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54437 + ... + 56525.

It is an arithmetic number, because the mean of its divisors is an integer number (14656125).

Almost surely, 2^115899809 is an apocalyptic number.

It is an amenable number.

115899809 is a deficient number, since it is larger than the sum of its proper divisors (1349191).

115899809 is a wasteful number, since it uses less digits than its factorization.

115899809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707.

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 115899809 is about 10765.6773590889. The cubic root of 115899809 is about 487.5594443401.

The spelling of 115899809 in words is "one hundred fifteen million, eight hundred ninety-nine thousand, eight hundred nine".