1091209623880 has 32 divisors (see below), whose sum is σ = 2507460416640. Its totient is φ = 427196958400.

The previous prime is 1091209623869. The next prime is 1091209623929. The reversal of 1091209623880 is 883269021901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290213446 + ... + 290217205.

It is an arithmetic number, because the mean of its divisors is an integer number (78358138020).

Almost surely, 2^{1091209623880} is an apocalyptic number.

1091209623880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091209623880 is an abundant number, since it is smaller than the sum of its proper divisors (1416250792760).

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

1091209623880 is a wasteful number, since it uses less digits than its factorization.

1091209623880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580430709 (or 580430705 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 1091209623880 in words is "one trillion, ninety-one billion, two hundred nine million, six hundred twenty-three thousand, eight hundred eighty".