1291064788 has 12 divisors (see below), whose sum is σ = 2433160660. Its totient is φ = 595876032.

The previous prime is 1291064783. The next prime is 1291064849. The reversal of 1291064788 is 8874601921.

It can be written as a sum of positive squares in 2 ways, for example, as 150111504 + 1140953284 = 12252^2 + 33778^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291064783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12414033 + ... + 12414136.

Almost surely, 2^1291064788 is an apocalyptic number.

It is an amenable number.

1291064788 is a deficient number, since it is larger than the sum of its proper divisors (1142095872).

1291064788 is a wasteful number, since it uses less digits than its factorization.

1291064788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24828186 (or 24828184 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1291064788 is about 35931.3900092941. The cubic root of 1291064788 is about 1088.8866639056.

The spelling of 1291064788 in words is "one billion, two hundred ninety-one million, sixty-four thousand, seven hundred eighty-eight".