206155223 has 4 divisors (see below), whose sum is σ = 206659680. Its totient is φ = 205650768.

The previous prime is 206155219. The next prime is 206155267. The reversal of 206155223 is 322551602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322551602 = 2 ⋅161275801.

It is a cyclic number.

It is not a de Polignac number, because 206155223 - 2² = 206155219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206155192 and 206155201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206155283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251615 + ... + 252432.

It is an arithmetic number, because the mean of its divisors is an integer number (51664920).

Almost surely, 2^206155223 is an apocalyptic number.

206155223 is a deficient number, since it is larger than the sum of its proper divisors (504457).

206155223 is an equidigital number, since it uses as much as digits as its factorization.

206155223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504456.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 206155223 is about 14358.1065255834. The cubic root of 206155223 is about 590.7423605719.

The spelling of 206155223 in words is "two hundred six million, one hundred fifty-five thousand, two hundred twenty-three".