201611225 has 6 divisors (see below), whose sum is σ = 249997950. Its totient is φ = 161288960.

The previous prime is 201611213. The next prime is 201611231. The reversal of 201611225 is 522116102.

It can be written as a sum of positive squares in 3 ways, for example, as 25969216 + 175642009 = 5096^2 + 13253^2 .

It is not a de Polignac number, because 201611225 - 2⁴ = 201611209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201611197 and 201611206.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4032200 + ... + 4032249.

It is an arithmetic number, because the mean of its divisors is an integer number (41666325).

Almost surely, 2^201611225 is an apocalyptic number.

201611225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

201611225 is a deficient number, since it is larger than the sum of its proper divisors (48386725).

201611225 is an equidigital number, since it uses as much as digits as its factorization.

201611225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8064459 (or 8064454 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 201611225 is about 14198.9867596248. The cubic root of 201611225 is about 586.3697660849.

Adding to 201611225 its reverse (522116102), we get a palindrome (723727327).

The spelling of 201611225 in words is "two hundred one million, six hundred eleven thousand, two hundred twenty-five".