1218776225 has 6 divisors (see below), whose sum is σ = 1511282550. Its totient is φ = 975020960.

The previous prime is 1218776203. The next prime is 1218776227. The reversal of 1218776225 is 5226778121.

It can be written as a sum of positive squares in 3 ways, for example, as 365727376 + 853048849 = 19124^2 + 29207^2 .

It is not a de Polignac number, because 1218776225 - 2³⁰ = 145034401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1218776227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24375500 + ... + 24375549.

It is an arithmetic number, because the mean of its divisors is an integer number (251880425).

Almost surely, 2^1218776225 is an apocalyptic number.

It is an amenable number.

1218776225 is a deficient number, since it is larger than the sum of its proper divisors (292506325).

1218776225 is an equidigital number, since it uses as much as digits as its factorization.

1218776225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48751059 (or 48751054 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 1218776225 is about 34910.9757096533. The cubic root of 1218776225 is about 1068.1723319404.

The spelling of 1218776225 in words is "one billion, two hundred eighteen million, seven hundred seventy-six thousand, two hundred twenty-five".