1291428916 has 12 divisors (see below), whose sum is σ = 2277253440. Its totient is φ = 640785080.

The previous prime is 1291428889. The next prime is 1291428937. The reversal of 1291428916 is 6198241921.

It is a congruent number.

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, 1231756 + ... + 1232803.

It is an arithmetic number, because the mean of its divisors is an integer number (189771120).

Almost surely, 2^1291428916 is an apocalyptic number.

It is an amenable number.

1291428916 is a deficient number, since it is larger than the sum of its proper divisors (985824524).

1291428916 is a wasteful number, since it uses less digits than its factorization.

1291428916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464694 (or 2464692 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 1291428916 is about 35936.4566422456. The cubic root of 1291428916 is about 1088.9890230480.

The spelling of 1291428916 in words is "one billion, two hundred ninety-one million, four hundred twenty-eight thousand, nine hundred sixteen".