1225812216 has 16 divisors (see below), whose sum is σ = 3064530600. Its totient is φ = 408604064.

The previous prime is 1225812193. The next prime is 1225812233. The reversal of 1225812216 is 6122185221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25537731 + ... + 25537778.

Almost surely, 2^1225812216 is an apocalyptic number.

It is an amenable number.

1225812216 is an abundant number, since it is smaller than the sum of its proper divisors (1838718384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225812216 is a wasteful number, since it uses less digits than its factorization.

1225812216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51075518 (or 51075514 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 1225812216 is about 35011.6011630431. The cubic root of 1225812216 is about 1070.2239074903.

Adding to 1225812216 its reverse (6122185221), we get a palindrome (7347997437).

The spelling of 1225812216 in words is "one billion, two hundred twenty-five million, eight hundred twelve thousand, two hundred sixteen".