206422225 has 6 divisors (see below), whose sum is σ = 255963590. Its totient is φ = 165137760.

The previous prime is 206422189. The next prime is 206422241. The reversal of 206422225 is 522224602.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16451136 + 189971089 = 4056^2 + 13783^2 .

It is not a de Polignac number, because 206422225 - 2¹¹ = 206420177 is a prime.

It is a super-2 number, since 2×206422225² = 85220269947901250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 8256889 = 206422225 / (2 + 0 + 6 + 4 + 2 + 2 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 206422225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4128420 + ... + 4128469.

Almost surely, 2^206422225 is an apocalyptic number.

206422225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206422225 is a deficient number, since it is larger than the sum of its proper divisors (49541365).

206422225 is an equidigital number, since it uses as much as digits as its factorization.

206422225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256899 (or 8256894 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 206422225 is about 14367.4014699945. The cubic root of 206422225 is about 590.9972839318.

Adding to 206422225 its reverse (522224602), we get a palindrome (728646827).

The spelling of 206422225 in words is "two hundred six million, four hundred twenty-two thousand, two hundred twenty-five".