115539091 has 4 divisors (see below), whose sum is σ = 115560592. Its totient is φ = 115517592.

The previous prime is 115539079. The next prime is 115539119. The reversal of 115539091 is 190935511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 190935511 = 13 ⋅14687347.

It is a cyclic number.

It is not a de Polignac number, because 115539091 - 2⁷ = 115538963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115539031) 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, 5146 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (28890148).

Almost surely, 2^115539091 is an apocalyptic number.

115539091 is a deficient number, since it is larger than the sum of its proper divisors (21501).

115539091 is a wasteful number, since it uses less digits than its factorization.

115539091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21500.

The product of its (nonzero) digits is 6075, while the sum is 34.

The square root of 115539091 is about 10748.9111541588. The cubic root of 115539091 is about 487.0531040169.

The spelling of 115539091 in words is "one hundred fifteen million, five hundred thirty-nine thousand, ninety-one".