1991739316 has 12 divisors (see below), whose sum is σ = 3983478688. Its totient is φ = 853602552.

The previous prime is 1991739307. The next prime is 1991739319. The reversal of 1991739316 is 6139371991.

1991739316 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1991739316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991739319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 35566746 + ... + 35566801.

Almost surely, 2^1991739316 is an apocalyptic number.

It is an amenable number.

1991739316 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1991739316 is a wasteful number, since it uses less digits than its factorization.

1991739316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71133558 (or 71133556 counting only the distinct ones).

The product of its digits is 275562, while the sum is 49.

The square root of 1991739316 is about 44628.9067309519. The cubic root of 1991739316 is about 1258.1840212448.

The spelling of 1991739316 in words is "one billion, nine hundred ninety-one million, seven hundred thirty-nine thousand, three hundred sixteen".