115644209 has 4 divisors (see below), whose sum is σ = 116725104. Its totient is φ = 114563316.

The previous prime is 115644187. The next prime is 115644223. The reversal of 115644209 is 902446511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902446511 = 3083 ⋅292717.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115644209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115644239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540287 + ... + 540500.

It is an arithmetic number, because the mean of its divisors is an integer number (29181276).

Almost surely, 2^115644209 is an apocalyptic number.

It is an amenable number.

115644209 is a deficient number, since it is larger than the sum of its proper divisors (1080895).

115644209 is a wasteful number, since it uses less digits than its factorization.

115644209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080894.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 115644209 is about 10753.7997470662. The cubic root of 115644209 is about 487.2007669676.

The spelling of 115644209 in words is "one hundred fifteen million, six hundred forty-four thousand, two hundred nine".