1331201322 has 48 divisors (see below), whose sum is σ = 3158213760. Its totient is φ = 401889600.

The previous prime is 1331201309. The next prime is 1331201327. The reversal of 1331201322 is 2231021331.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1331201295 and 1331201304.

It is not an unprimeable number, because it can be changed into a prime (1331201327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41254 + ... + 66062.

It is an arithmetic number, because the mean of its divisors is an integer number (65796120).

Almost surely, 2^1331201322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331201322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1579106880).

1331201322 is an abundant number, since it is smaller than the sum of its proper divisors (1827012438).

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

1331201322 is a wasteful number, since it uses less digits than its factorization.

1331201322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25099 (or 25096 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1331201322 is about 36485.6317198976. The cubic root of 1331201322 is about 1100.0554578100.

Adding to 1331201322 its reverse (2231021331), we get a palindrome (3562222653).

Subtracting 1331201322 from its reverse (2231021331), we obtain a square (899820009 = 29997²).

The spelling of 1331201322 in words is "one billion, three hundred thirty-one million, two hundred one thousand, three hundred twenty-two".