206105231 has 8 divisors (see below), whose sum is σ = 218712960. Its totient is φ = 193801432.

The previous prime is 206105209. The next prime is 206105257. The reversal of 206105231 is 132501602.

206105231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 206105231 - 2⁶ = 206105167 is a prime.

It is a super-2 number, since 2×206105231² = 84958732491126722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206105201) 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, 74585 + ... + 77298.

It is an arithmetic number, because the mean of its divisors is an integer number (27339120).

Almost surely, 2^206105231 is an apocalyptic number.

206105231 is a deficient number, since it is larger than the sum of its proper divisors (12607729).

206105231 is a wasteful number, since it uses less digits than its factorization.

206105231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151965.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 206105231 is about 14356.3655219558. The cubic root of 206105231 is about 590.6946056503.

Adding to 206105231 its reverse (132501602), we get a palindrome (338606833).

The spelling of 206105231 in words is "two hundred six million, one hundred five thousand, two hundred thirty-one".