1991274471340 has 48 divisors (see below), whose sum is σ = 5213518619904. Its totient is φ = 620656977600.

The previous prime is 1991274471311. The next prime is 1991274471359. The reversal of 1991274471340 is 431744721991.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646516146 + ... + 646519225.

It is an arithmetic number, because the mean of its divisors is an integer number (108614971248).

Almost surely, 2^{1991274471340} is an apocalyptic number.

1991274471340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991274471340 is an abundant number, since it is smaller than the sum of its proper divisors (3222244148564).

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

1991274471340 is a wasteful number, since it uses less digits than its factorization.

1991274471340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293035398 (or 1293035396 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 1991274471340 in words is "one trillion, nine hundred ninety-one billion, two hundred seventy-four million, four hundred seventy-one thousand, three hundred forty".