205654121 has 8 divisors (see below), whose sum is σ = 207462600. Its totient is φ = 203851648.

The previous prime is 205653983. The next prime is 205654139. The reversal of 205654121 is 121456502.

It can be written as a sum of positive squares in 4 ways, for example, as 133225 + 205520896 = 365^2 + 14336^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205654121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205654171) 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, 90815 + ... + 93051.

It is an arithmetic number, because the mean of its divisors is an integer number (25932825).

Almost surely, 2^205654121 is an apocalyptic number.

It is an amenable number.

205654121 is a deficient number, since it is larger than the sum of its proper divisors (1808479).

205654121 is a wasteful number, since it uses less digits than its factorization.

205654121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205654121 is about 14340.6457664918. The cubic root of 205654121 is about 590.2633326082.

The spelling of 205654121 in words is "two hundred five million, six hundred fifty-four thousand, one hundred twenty-one".