205654321 has 16 divisors (see below), whose sum is σ = 221429376. Its totient is φ = 190318336.

The previous prime is 205654303. The next prime is 205654349. The reversal of 205654321 is 123456502.

It is a cyclic number.

It is not a de Polignac number, because 205654321 - 2⁷ = 205654193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205654321.

It is not an unprimeable number, because it can be changed into a prime (205654381) 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, 303435 + ... + 304111.

It is an arithmetic number, because the mean of its divisors is an integer number (13839336).

Almost surely, 2^205654321 is an apocalyptic number.

It is an amenable number.

205654321 is a deficient number, since it is larger than the sum of its proper divisors (15775055).

205654321 is a wasteful number, since it uses less digits than its factorization.

205654321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 205654321 is about 14340.6527396768. The cubic root of 205654321 is about 590.2635239531.

The spelling of 205654321 in words is "two hundred five million, six hundred fifty-four thousand, three hundred twenty-one".