1220311331 has 8 divisors (see below), whose sum is σ = 1251046944. Its totient is φ = 1189622080.

The previous prime is 1220311327. The next prime is 1220311363. The reversal of 1220311331 is 1331130221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220311331 - 2² = 1220311327 is a prime.

It is a super-2 number, since 2×1220311331² = 2978319489133983122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220311531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45161 + ... + 66933.

It is an arithmetic number, because the mean of its divisors is an integer number (156380868).

Almost surely, 2^1220311331 is an apocalyptic number.

1220311331 is a deficient number, since it is larger than the sum of its proper divisors (30735613).

1220311331 is a wasteful number, since it uses less digits than its factorization.

1220311331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23181.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1220311331 is about 34932.9547991578. The cubic root of 1220311331 is about 1068.6206148854.

Adding to 1220311331 its reverse (1331130221), we get a palindrome (2551441552).

The spelling of 1220311331 in words is "one billion, two hundred twenty million, three hundred eleven thousand, three hundred thirty-one".