1220803311 has 32 divisors (see below), whose sum is σ = 2005319680. Its totient is φ = 643313664.

The previous prime is 1220803307. The next prime is 1220803327. The reversal of 1220803311 is 1133080221.

It is not a de Polignac number, because 1220803311 - 2² = 1220803307 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220803811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 452655 + ... + 455343.

It is an arithmetic number, because the mean of its divisors is an integer number (62666240).

Almost surely, 2^1220803311 is an apocalyptic number.

1220803311 is a deficient number, since it is larger than the sum of its proper divisors (784516369).

1220803311 is a wasteful number, since it uses less digits than its factorization.

1220803311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1220803311 is about 34939.9958643386. The cubic root of 1220803311 is about 1068.7642037441.

Adding to 1220803311 its reverse (1133080221), we get a palindrome (2353883532).

The spelling of 1220803311 in words is "one billion, two hundred twenty million, eight hundred three thousand, three hundred eleven".