1211522225 has 24 divisors (see below), whose sum is σ = 1532163840. Its totient is φ = 950040000.

The previous prime is 1211522219. The next prime is 1211522231. The reversal of 1211522225 is 5222251121.

It is an interprime number because it is at equal distance from previous prime (1211522219) and next prime (1211522231).

It is a de Polignac number, because none of the positive numbers 2^k-1211522225 is a prime.

It is a super-2 number, since 2×1211522225² = 2935572203337901250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211522225.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 620000 + ... + 621950.

It is an arithmetic number, because the mean of its divisors is an integer number (63840160).

Almost surely, 2^1211522225 is an apocalyptic number.

It is an amenable number.

1211522225 is a deficient number, since it is larger than the sum of its proper divisors (320641615).

1211522225 is a wasteful number, since it uses less digits than its factorization.

1211522225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441 (or 2436 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 1211522225 is about 34806.9278305340. The cubic root of 1211522225 is about 1066.0489052583.

Adding to 1211522225 its reverse (5222251121), we get a palindrome (6433773346).

The spelling of 1211522225 in words is "one billion, two hundred eleven million, five hundred twenty-two thousand, two hundred twenty-five".