206905121 has 8 divisors (see below), whose sum is σ = 212371104. Its totient is φ = 201468960.

The previous prime is 206905099. The next prime is 206905157. The reversal of 206905121 is 121509602.

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

It is a cyclic number.

It is not a de Polignac number, because 206905121 - 2¹⁰ = 206904097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206904121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6965 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (26546388).

Almost surely, 2^206905121 is an apocalyptic number.

It is an amenable number.

206905121 is a deficient number, since it is larger than the sum of its proper divisors (5465983).

206905121 is a wasteful number, since it uses less digits than its factorization.

206905121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14911.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 206905121 is about 14384.1969188412. The cubic root of 206905121 is about 591.4577769329.

The spelling of 206905121 in words is "two hundred six million, nine hundred five thousand, one hundred twenty-one".