115199989 has 4 divisors (see below), whose sum is σ = 115258156. Its totient is φ = 115141824.

The previous prime is 115199957. The next prime is 115200017. The reversal of 115199989 is 989991511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989991511 = 6547 ⋅151213.

It can be written as a sum of positive squares in 2 ways, for example, as 17783089 + 97416900 = 4217^2 + 9870^2 .

It is a cyclic number.

It is not a de Polignac number, because 115199989 - 2⁵ = 115199957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115199789) 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, 26004 + ... + 30109.

It is an arithmetic number, because the mean of its divisors is an integer number (28814539).

Almost surely, 2^115199989 is an apocalyptic number.

It is an amenable number.

115199989 is a deficient number, since it is larger than the sum of its proper divisors (58167).

115199989 is an equidigital number, since it uses as much as digits as its factorization.

115199989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58166.

The product of its digits is 262440, while the sum is 52.

The square root of 115199989 is about 10733.1257795667. The cubic root of 115199989 is about 486.5761441588.

The spelling of 115199989 in words is "one hundred fifteen million, one hundred ninety-nine thousand, nine hundred eighty-nine".