1291128792 has 32 divisors (see below), whose sum is σ = 3229314480. Its totient is φ = 430177280.

The previous prime is 1291128791. The next prime is 1291128799. The reversal of 1291128792 is 2978211921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291128791) 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 7 ways as a sum of consecutive naturals, for example, 46192 + ... + 68672.

Almost surely, 2^1291128792 is an apocalyptic number.

1291128792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1291128792 is an abundant number, since it is smaller than the sum of its proper divisors (1938185688).

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

1291128792 is a wasteful number, since it uses less digits than its factorization.

1291128792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24883 (or 24879 counting only the distinct ones).

The product of its digits is 36288, while the sum is 42.

The square root of 1291128792 is about 35932.2806401152. The cubic root of 1291128792 is about 1088.9046573094.

The spelling of 1291128792 in words is "one billion, two hundred ninety-one million, one hundred twenty-eight thousand, seven hundred ninety-two".