115866591 has 8 divisors (see below), whose sum is σ = 154635264. Its totient is φ = 77171160.

The previous prime is 115866559. The next prime is 115866593. The reversal of 115866591 is 195668511.

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

It is not a de Polignac number, because 115866591 - 2⁵ = 115866559 is a prime.

It is a super-2 number, since 2×115866591² = 26850133819922562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115866593) 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, 14505 + ... + 21026.

It is an arithmetic number, because the mean of its divisors is an integer number (19329408).

Almost surely, 2^115866591 is an apocalyptic number.

115866591 is a deficient number, since it is larger than the sum of its proper divisors (38768673).

115866591 is a wasteful number, since it uses less digits than its factorization.

115866591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36621.

The product of its digits is 64800, while the sum is 42.

The square root of 115866591 is about 10764.1344751912. The cubic root of 115866591 is about 487.5128601473.

The spelling of 115866591 in words is "one hundred fifteen million, eight hundred sixty-six thousand, five hundred ninety-one".