1220320311 has 32 divisors (see below), whose sum is σ = 1893926400. Its totient is φ = 684478080.

The previous prime is 1220320259. The next prime is 1220320327. The reversal of 1220320311 is 1130230221.

It is not a de Polignac number, because 1220320311 - 2⁶ = 1220320247 is a prime.

It is a super-2 number, since 2×1220320311² = 2978363322878273442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220320411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1099825 + ... + 1100933.

It is an arithmetic number, because the mean of its divisors is an integer number (59185200).

Almost surely, 2^1220320311 is an apocalyptic number.

1220320311 is a deficient number, since it is larger than the sum of its proper divisors (673606089).

1220320311 is a wasteful number, since it uses less digits than its factorization.

1220320311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039.

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

The square root of 1220320311 is about 34933.0833308484. The cubic root of 1220320311 is about 1068.6232361262.

Adding to 1220320311 its reverse (1130230221), we get a palindrome (2350550532).

The spelling of 1220320311 in words is "one billion, two hundred twenty million, three hundred twenty thousand, three hundred eleven".