1991127011330 has 32 divisors (see below), whose sum is σ = 3592150653168. Its totient is φ = 794646246400.

The previous prime is 1991127011317. The next prime is 1991127011351. The reversal of 1991127011330 is 331107211991.

It is a Cunningham number, because it is equal to 1411073²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 971105789809 + 1020021221521 = 985447^2 + 1009961^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 86255390 + ... + 86278470.

Almost surely, 2^{1991127011330} is an apocalyptic number.

1991127011330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1991127011330 is a deficient number, since it is larger than the sum of its proper divisors (1601023641838).

1991127011330 is a wasteful number, since it uses less digits than its factorization.

1991127011330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42262.

The product of its (nonzero) digits is 10206, while the sum is 38.

The spelling of 1991127011330 in words is "one trillion, nine hundred ninety-one billion, one hundred twenty-seven million, eleven thousand, three hundred thirty".