1991348292 has 24 divisors (see below), whose sum is σ = 4681952352. Its totient is φ = 658715200.

The previous prime is 1991348273. The next prime is 1991348297. The reversal of 1991348292 is 2928431991.

It is not an unprimeable number, because it can be changed into a prime (1991348297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631809 + ... + 634952.

It is an arithmetic number, because the mean of its divisors is an integer number (195081348).

Almost surely, 2^1991348292 is an apocalyptic number.

1991348292 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1991348292 is an abundant number, since it is smaller than the sum of its proper divisors (2690604060).

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

1991348292 is a wasteful number, since it uses less digits than its factorization.

1991348292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266899 (or 1266897 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 1991348292 is about 44624.5256781515. The cubic root of 1991348292 is about 1258.1016790855.

The spelling of 1991348292 in words is "one billion, nine hundred ninety-one million, three hundred forty-eight thousand, two hundred ninety-two".