1331244688 has 20 divisors (see below), whose sum is σ = 2594201148. Its totient is φ = 661773440.

The previous prime is 1331244679. The next prime is 1331244731. The reversal of 1331244688 is 8864421331.

It can be written as a sum of positive squares in 2 ways, for example, as 1116094464 + 215150224 = 33408^2 + 14668^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1331244688.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237703 + ... + 243238.

Almost surely, 2^1331244688 is an apocalyptic number.

It is an amenable number.

1331244688 is a deficient number, since it is larger than the sum of its proper divisors (1262956460).

1331244688 is a wasteful number, since it uses less digits than its factorization.

1331244688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481122 (or 481116 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 1331244688 is about 36486.2260037949. The cubic root of 1331244688 is about 1100.0674030323.

The spelling of 1331244688 in words is "one billion, three hundred thirty-one million, two hundred forty-four thousand, six hundred eighty-eight".