1211231225 has 24 divisors (see below), whose sum is σ = 1588231680. Its totient is φ = 914832000.

The previous prime is 1211231213. The next prime is 1211231233. The reversal of 1211231225 is 5221321121.

It is a de Polignac number, because none of the positive numbers 2^k-1211231225 is a prime.

It is a Curzon number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 1211231197 and 1211231206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12716 + ... + 50834.

It is an arithmetic number, because the mean of its divisors is an integer number (66176320).

Almost surely, 2^1211231225 is an apocalyptic number.

It is an amenable number.

1211231225 is a deficient number, since it is larger than the sum of its proper divisors (377000455).

1211231225 is a wasteful number, since it uses less digits than its factorization.

1211231225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38201 (or 38196 counting only the distinct ones).

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

The square root of 1211231225 is about 34802.7473771827. The cubic root of 1211231225 is about 1065.9635456817.

Adding to 1211231225 its reverse (5221321121), we get a palindrome (6432552346).

The spelling of 1211231225 in words is "one billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-five".