1331161326 has 24 divisors (see below), whose sum is σ = 3146381784. Its totient is φ = 403382160.

The previous prime is 1331161291. The next prime is 1331161327. The reversal of 1331161326 is 6231611331.

1331161326 is a `hidden beast` number, since 1 + 33 + 11 + 613 + 2 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1331161326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331161327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3361321 + ... + 3361716.

It is an arithmetic number, because the mean of its divisors is an integer number (131099241).

Almost surely, 2^1331161326 is an apocalyptic number.

1331161326 is an abundant number, since it is smaller than the sum of its proper divisors (1815220458).

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

1331161326 is a wasteful number, since it uses less digits than its factorization.

1331161326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723056 (or 6723053 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 1331161326 is about 36485.0836096068. The cubic root of 1331161326 is about 1100.0444406288.

Adding to 1331161326 its reverse (6231611331), we get a palindrome (7562772657).

The spelling of 1331161326 in words is "one billion, three hundred thirty-one million, one hundred sixty-one thousand, three hundred twenty-six".