1220203311 has 8 divisors (see below), whose sum is σ = 1627971840. Its totient is φ = 812951832.

The previous prime is 1220203297. The next prime is 1220203349. The reversal of 1220203311 is 1133020221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220203311 - 2⁶ = 1220203247 is a prime.

It is a super-2 number, since 2×1220203311² = 2977792240350725442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220203211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123721 + ... + 133218.

It is an arithmetic number, because the mean of its divisors is an integer number (203496480).

Almost surely, 2^1220203311 is an apocalyptic number.

1220203311 is a deficient number, since it is larger than the sum of its proper divisors (407768529).

1220203311 is a wasteful number, since it uses less digits than its factorization.

1220203311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258525.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1220203311 is about 34931.4086604019. The cubic root of 1220203311 is about 1068.5890830946.

Adding to 1220203311 its reverse (1133020221), we get a palindrome (2353223532).

The spelling of 1220203311 in words is "one billion, two hundred twenty million, two hundred three thousand, three hundred eleven".