1320111312 has 160 divisors (see below), whose sum is σ = 3899750400. Its totient is φ = 381697536.

The previous prime is 1320111301. The next prime is 1320111329. The reversal of 1320111312 is 2131110231.

It is a happy number.

It is a super-2 number, since 2×1320111312² = 3485387752140722688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1320111291 and 1320111300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 845989 + ... + 847547.

It is an arithmetic number, because the mean of its divisors is an integer number (24373440).

Almost surely, 2^1320111312 is an apocalyptic number.

1320111312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949875200).

1320111312 is an abundant number, since it is smaller than the sum of its proper divisors (2579639088).

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

1320111312 is a wasteful number, since it uses less digits than its factorization.

1320111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1320111312 is about 36333.3360978592. The cubic root of 1320111312 is about 1096.9921442050.

Adding to 1320111312 its reverse (2131110231), we get a palindrome (3451221543).

The spelling of 1320111312 in words is "one billion, three hundred twenty million, one hundred eleven thousand, three hundred twelve".