205133391 has 20 divisors (see below), whose sum is σ = 307799800. Its totient is φ = 136146096.

The previous prime is 205133359. The next prime is 205133393. The reversal of 205133391 is 193331502.

It is a happy number.

205133391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 205133391 - 2⁵ = 205133359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205133393) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13020 + ... + 24078.

It is an arithmetic number, because the mean of its divisors is an integer number (15389990).

Almost surely, 2^205133391 is an apocalyptic number.

205133391 is a deficient number, since it is larger than the sum of its proper divisors (102666409).

205133391 is a wasteful number, since it uses less digits than its factorization.

205133391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11300 (or 11291 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 205133391 is about 14322.4785215409. The cubic root of 205133391 is about 589.7647161050.

Adding to 205133391 its reverse (193331502), we get a palindrome (398464893).

The spelling of 205133391 in words is "two hundred five million, one hundred thirty-three thousand, three hundred ninety-one".