1224255516 has 24 divisors (see below), whose sum is σ = 3116287104. Its totient is φ = 370986480.

The previous prime is 1224255511. The next prime is 1224255517. The reversal of 1224255516 is 6155524221.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224255511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4637200 + ... + 4637463.

It is an arithmetic number, because the mean of its divisors is an integer number (129845296).

Almost surely, 2^1224255516 is an apocalyptic number.

It is an amenable number.

1224255516 is an abundant number, since it is smaller than the sum of its proper divisors (1892031588).

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

1224255516 is a wasteful number, since it uses less digits than its factorization.

1224255516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9274681 (or 9274679 counting only the distinct ones).

The product of its digits is 24000, while the sum is 33.

The square root of 1224255516 is about 34989.3628978866. The cubic root of 1224255516 is about 1069.7706778474.

Adding to 1224255516 its reverse (6155524221), we get a palindrome (7379779737).

The spelling of 1224255516 in words is "one billion, two hundred twenty-four million, two hundred fifty-five thousand, five hundred sixteen".