2311311220 has 24 divisors (see below), whose sum is σ = 4856108544. Its totient is φ = 924075936.

The previous prime is 2311311199. The next prime is 2311311241. The reversal of 2311311220 is 221131132.

It is an interprime number because it is at equal distance from previous prime (2311311199) and next prime (2311311241).

It is a junction number, because it is equal to n+sod(n) for n = 2311311194 and 2311311203.

It is a congruent number.

It is an unprimeable number.

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, 15897 + ... + 69823.

It is an arithmetic number, because the mean of its divisors is an integer number (202337856).

Almost surely, 2^2311311220 is an apocalyptic number.

2311311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311311220 is an abundant number, since it is smaller than the sum of its proper divisors (2544797324).

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

2311311220 is a wasteful number, since it uses less digits than its factorization.

2311311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56079 (or 56077 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2311311220 is about 48076.0982193855. The cubic root of 2311311220 is about 1322.1664797671.

Adding to 2311311220 its reverse (221131132), we get a palindrome (2532442352).

The spelling of 2311311220 in words is "two billion, three hundred eleven million, three hundred eleven thousand, two hundred twenty".