205801291 has 4 divisors (see below), whose sum is σ = 205858584. Its totient is φ = 205744000.

The previous prime is 205801273. The next prime is 205801301. The reversal of 205801291 is 192108502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205801291 - 2⁵ = 205801259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205801691) 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, 22870 + ... + 30571.

It is an arithmetic number, because the mean of its divisors is an integer number (51464646).

Almost surely, 2^205801291 is an apocalyptic number.

205801291 is a deficient number, since it is larger than the sum of its proper divisors (57293).

205801291 is an equidigital number, since it uses as much as digits as its factorization.

205801291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57292.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 205801291 is about 14345.7760682369. The cubic root of 205801291 is about 590.4041002569.

Adding to 205801291 its reverse (192108502), we get a palindrome (397909793).

The spelling of 205801291 in words is "two hundred five million, eight hundred one thousand, two hundred ninety-one".