206215225 has 12 divisors (see below), whose sum is σ = 258582780. Its totient is φ = 163116800.

The previous prime is 206215183. The next prime is 206215231. The reversal of 206215225 is 522512602.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 42042256 + 164172969 = 6484^2 + 12813^2 .

It is not a de Polignac number, because 206215225 - 2¹¹ = 206213177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 206215225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44116 + ... + 48565.

It is an arithmetic number, because the mean of its divisors is an integer number (21548565).

Almost surely, 2^206215225 is an apocalyptic number.

206215225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

206215225 is a deficient number, since it is larger than the sum of its proper divisors (52367555).

206215225 is an equidigital number, since it uses as much as digits as its factorization.

206215225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92780 (or 92775 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 206215225 is about 14360.1958552103. The cubic root of 206215225 is about 590.7996673661.

Adding to 206215225 its reverse (522512602), we get a palindrome (728727827).

The spelling of 206215225 in words is "two hundred six million, two hundred fifteen thousand, two hundred twenty-five".