1331111997 has 12 divisors (see below), whose sum is σ = 1933833564. Its totient is φ = 882277440.

The previous prime is 1331111989. The next prime is 1331112017. The reversal of 1331111997 is 7991111331.

It can be written as a sum of positive squares in 2 ways, for example, as 914094756 + 417017241 = 30234^2 + 20421^2 .

It is not a de Polignac number, because 1331111997 - 2³ = 1331111989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331111797) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 425904 + ... + 429017.

It is an arithmetic number, because the mean of its divisors is an integer number (161152797).

Almost surely, 2^1331111997 is an apocalyptic number.

It is an amenable number.

1331111997 is a deficient number, since it is larger than the sum of its proper divisors (602721567).

1331111997 is a wasteful number, since it uses less digits than its factorization.

1331111997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855100 (or 855097 counting only the distinct ones).

The product of its digits is 5103, while the sum is 36.

The square root of 1331111997 is about 36484.4075873516. The cubic root of 1331111997 is about 1100.0308523027.

The spelling of 1331111997 in words is "one billion, three hundred thirty-one million, one hundred eleven thousand, nine hundred ninety-seven".