1331222000 has 80 divisors (see below), whose sum is σ = 3244104864. Its totient is φ = 528320000.

The previous prime is 1331221987. The next prime is 1331222021. The reversal of 1331222000 is 2221331.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 259460 + ... + 264540.

Almost surely, 2^1331222000 is an apocalyptic number.

1331222000 is a gapful number since it is divisible by the number (10) 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 1331222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1622052432).

1331222000 is an abundant number, since it is smaller than the sum of its proper divisors (1912882864).

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

1331222000 is a wasteful number, since it uses less digits than its factorization.

1331222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5235 (or 5219 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1331222000 is about 36485.9150906209. The cubic root of 1331222000 is about 1100.0611536249.

Adding to 1331222000 its reverse (2221331), we get a palindrome (1333443331).

The spelling of 1331222000 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand".