205116591 has 8 divisors (see below), whose sum is σ = 273683584. Its totient is φ = 136647000.

The previous prime is 205116559. The next prime is 205116617. The reversal of 205116591 is 195611502.

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

It is not a de Polignac number, because 205116591 - 2⁵ = 205116559 is a prime.

It is a super-2 number, since 2×205116591² = 84145631806922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205116521) 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, 19285 + ... + 27966.

It is an arithmetic number, because the mean of its divisors is an integer number (34210448).

Almost surely, 2^205116591 is an apocalyptic number.

205116591 is a deficient number, since it is larger than the sum of its proper divisors (68566993).

205116591 is a wasteful number, since it uses less digits than its factorization.

205116591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48701.

The product of its (nonzero) digits is 2700, while the sum is 30.

The square root of 205116591 is about 14321.8920188640. The cubic root of 205116591 is about 589.7486154957.

The spelling of 205116591 in words is "two hundred five million, one hundred sixteen thousand, five hundred ninety-one".