1220511236 has 48 divisors (see below), whose sum is σ = 2488886400. Its totient is φ = 512904960.

The previous prime is 1220511233. The next prime is 1220511239. The reversal of 1220511236 is 6321150221.

It is an interprime number because it is at equal distance from previous prime (1220511233) and next prime (1220511239).

It is not an unprimeable number, because it can be changed into a prime (1220511233) 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 15 ways as a sum of consecutive naturals, for example, 368315 + ... + 371613.

It is an arithmetic number, because the mean of its divisors is an integer number (51851800).

Almost surely, 2^1220511236 is an apocalyptic number.

It is an amenable number.

1220511236 is an abundant number, since it is smaller than the sum of its proper divisors (1268375164).

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

1220511236 is a wasteful number, since it uses less digits than its factorization.

1220511236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564 (or 3562 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1220511236 is about 34935.8159486794. The cubic root of 1220511236 is about 1068.6789636403.

Adding to 1220511236 its reverse (6321150221), we get a palindrome (7541661457).

The spelling of 1220511236 in words is "one billion, two hundred twenty million, five hundred eleven thousand, two hundred thirty-six".