1211144225 has 6 divisors (see below), whose sum is σ = 1501818870. Its totient is φ = 968915360.

The previous prime is 1211144201. The next prime is 1211144237. The reversal of 1211144225 is 5224411121.

It can be written as a sum of positive squares in 3 ways, for example, as 21446161 + 1189698064 = 4631^2 + 34492^2 .

It is not a de Polignac number, because 1211144225 - 2⁶ = 1211144161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211144225.

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, 24222860 + ... + 24222909.

It is an arithmetic number, because the mean of its divisors is an integer number (250303145).

Almost surely, 2^1211144225 is an apocalyptic number.

It is an amenable number.

1211144225 is a deficient number, since it is larger than the sum of its proper divisors (290674645).

1211144225 is an equidigital number, since it uses as much as digits as its factorization.

1211144225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48445779 (or 48445774 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 1211144225 is about 34801.4974534143. The cubic root of 1211144225 is about 1065.9380231536.

Adding to 1211144225 its reverse (5224411121), we get a palindrome (6435555346).

The spelling of 1211144225 in words is "one billion, two hundred eleven million, one hundred forty-four thousand, two hundred twenty-five".