1291296320 has 56 divisors (see below), whose sum is σ = 3174114048. Its totient is φ = 499852800.

The previous prime is 1291296287. The next prime is 1291296329. The reversal of 1291296320 is 236921921.

It is not an unprimeable number, because it can be changed into a prime (1291296329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55166 + ... + 75005.

It is an arithmetic number, because the mean of its divisors is an integer number (56680608).

Almost surely, 2^1291296320 is an apocalyptic number.

1291296320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291296320 is an abundant number, since it is smaller than the sum of its proper divisors (1882817728).

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

1291296320 is a wasteful number, since it uses less digits than its factorization.

1291296320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130219 (or 130209 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1291296320 is about 35934.6117274140. The cubic root of 1291296320 is about 1088.9517515346.

The spelling of 1291296320 in words is "one billion, two hundred ninety-one million, two hundred ninety-six thousand, three hundred twenty".