1291065288 has 16 divisors (see below), whose sum is σ = 3227663280. Its totient is φ = 430355088.

The previous prime is 1291065283. The next prime is 1291065299. The reversal of 1291065288 is 8825601921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1291065283) 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, 26897170 + ... + 26897217.

It is an arithmetic number, because the mean of its divisors is an integer number (201728955).

Almost surely, 2^1291065288 is an apocalyptic number.

It is an amenable number.

1291065288 is an abundant number, since it is smaller than the sum of its proper divisors (1936597992).

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

1291065288 is a wasteful number, since it uses less digits than its factorization.

1291065288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53794396 (or 53794392 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1291065288 is about 35931.3969669981. The cubic root of 1291065288 is about 1088.8868044725.

The spelling of 1291065288 in words is "one billion, two hundred ninety-one million, sixty-five thousand, two hundred eighty-eight".