1211463442225 has 81 divisors (see below), whose sum is σ = 1671144743233. Its totient is φ = 870951811840.

The previous prime is 1211463442207. The next prime is 1211463442243. The reversal of 1211463442225 is 5222443641121.

The square root of 1211463442225 is 1100665.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1211463442207) and next prime (1211463442243).

It can be written as a sum of positive squares in 4 ways, for example, as 28337345569 + 1183126096656 = 168337^2 + 1087716^2 .

It is not a de Polignac number, because 1211463442225 - 2¹¹ = 1211463440177 is a prime.

It is a super-3 number, since 3×1211463442225³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2151799794 + ... + 2151800356.

Almost surely, 2^{1211463442225} is an apocalyptic number.

1211463442225 is the 1100665-th square number.

1211463442225 is the 550333-rd centered octagonal number.

It is an amenable number.

1211463442225 is a deficient number, since it is larger than the sum of its proper divisors (459681301008).

1211463442225 is an frugal number, since it uses more digits than its factorization.

1211463442225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 608 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The spelling of 1211463442225 in words is "one trillion, two hundred eleven billion, four hundred sixty-three million, four hundred forty-two thousand, two hundred twenty-five".