206136231 has 16 divisors (see below), whose sum is σ = 314694144. Its totient is φ = 117573984.

The previous prime is 206136223. The next prime is 206136241. The reversal of 206136231 is 132631602.

It is a happy number.

206136231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206136231 - 2³ = 206136223 is a prime.

It is a super-2 number, since 2×206136231² = 84984291461770722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206136211) 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, 2886 + ... + 20508.

It is an arithmetic number, because the mean of its divisors is an integer number (19668384).

Almost surely, 2^206136231 is an apocalyptic number.

206136231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

206136231 is a deficient number, since it is larger than the sum of its proper divisors (108557913).

206136231 is a wasteful number, since it uses less digits than its factorization.

206136231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18190.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 206136231 is about 14357.4451418071. The cubic root of 206136231 is about 590.7242193492.

Adding to 206136231 its reverse (132631602), we get a palindrome (338767833).

The spelling of 206136231 in words is "two hundred six million, one hundred thirty-six thousand, two hundred thirty-one".