205491361 has 16 divisors (see below), whose sum is σ = 223119360. Its totient is φ = 188668480.

The previous prime is 205491353. The next prime is 205491383. The reversal of 205491361 is 163194502.

205491361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 205491361 - 2³ = 205491353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205491331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126591 + ... + 128203.

It is an arithmetic number, because the mean of its divisors is an integer number (13944960).

Almost surely, 2^205491361 is an apocalyptic number.

It is an amenable number.

205491361 is a deficient number, since it is larger than the sum of its proper divisors (17627999).

205491361 is a wasteful number, since it uses less digits than its factorization.

205491361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 205491361 is about 14334.9698639376. The cubic root of 205491361 is about 590.1075749456.

The spelling of 205491361 in words is "two hundred five million, four hundred ninety-one thousand, three hundred sixty-one".