1331222320 has 40 divisors (see below), whose sum is σ = 3096989280. Its totient is φ = 532162560.

The previous prime is 1331222257. The next prime is 1331222329. The reversal of 1331222320 is 232221331.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1331222329) 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, 159040 + ... + 167200.

It is an arithmetic number, because the mean of its divisors is an integer number (77424732).

Almost surely, 2^1331222320 is an apocalyptic number.

1331222320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331222320 is an abundant number, since it is smaller than the sum of its proper divisors (1765766960).

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

1331222320 is a wasteful number, since it uses less digits than its factorization.

1331222320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10213 (or 10207 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1331222320 is about 36485.9194758745. The cubic root of 1331222320 is about 1100.0612417694.

Adding to 1331222320 its reverse (232221331), we get a palindrome (1563443651).

The spelling of 1331222320 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, three hundred twenty".