206213231 has 8 divisors (see below), whose sum is σ = 241420704. Its totient is φ = 172442880.

The previous prime is 206213221. The next prime is 206213233. The reversal of 206213231 is 132312602.

It is a happy number.

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 206213231 - 2⁶ = 206213167 is a prime.

It is a super-2 number, since 2×206213231² = 85047793278918722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206213233) 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, 358970 + ... + 359543.

It is an arithmetic number, because the mean of its divisors is an integer number (30177588).

Almost surely, 2^206213231 is an apocalyptic number.

206213231 is a deficient number, since it is larger than the sum of its proper divisors (35207473).

206213231 is an equidigital number, since it uses as much as digits as its factorization.

206213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718561.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 206213231 is about 14360.1264270201. The cubic root of 206213231 is about 590.7977631124.

Adding to 206213231 its reverse (132312602), we get a palindrome (338525833).

The spelling of 206213231 in words is "two hundred six million, two hundred thirteen thousand, two hundred thirty-one".