1220120225 has 6 divisors (see below), whose sum is σ = 1512949110. Its totient is φ = 976096160.

The previous prime is 1220120221. The next prime is 1220120249. The reversal of 1220120225 is 5220210221.

It can be written as a sum of positive squares in 3 ways, for example, as 107163904 + 1112956321 = 10352^2 + 33361^2 .

It is not a de Polignac number, because 1220120225 - 2² = 1220120221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220120221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24402380 + ... + 24402429.

It is an arithmetic number, because the mean of its divisors is an integer number (252158185).

Almost surely, 2^1220120225 is an apocalyptic number.

It is an amenable number.

1220120225 is a deficient number, since it is larger than the sum of its proper divisors (292828885).

1220120225 is an equidigital number, since it uses as much as digits as its factorization.

1220120225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48804819 (or 48804814 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1220120225 is about 34930.2193666172. The cubic root of 1220120225 is about 1068.5648284459.

Adding to 1220120225 its reverse (5220210221), we get a palindrome (6440330446).

The spelling of 1220120225 in words is "one billion, two hundred twenty million, one hundred twenty thousand, two hundred twenty-five".