1291169980 has 24 divisors (see below), whose sum is σ = 2748603312. Its totient is φ = 509392512.

The previous prime is 1291169969. The next prime is 1291169989. The reversal of 1291169980 is 899611921.

It is a self number, because there is not a number n which added to its sum of digits gives 1291169980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291169989) 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, 440722 + ... + 443641.

It is an arithmetic number, because the mean of its divisors is an integer number (114525138).

Almost surely, 2^1291169980 is an apocalyptic number.

1291169980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291169980 is an abundant number, since it is smaller than the sum of its proper divisors (1457433332).

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

1291169980 is a wasteful number, since it uses less digits than its factorization.

1291169980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884445 (or 884443 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 46.

The square root of 1291169980 is about 35932.8537692179. The cubic root of 1291169980 is about 1088.9162361512.

The spelling of 1291169980 in words is "one billion, two hundred ninety-one million, one hundred sixty-nine thousand, nine hundred eighty".