1991069298 has 24 divisors (see below), whose sum is σ = 4462742700. Its totient is φ = 640803744.

The previous prime is 1991069293. The next prime is 1991069303. The reversal of 1991069298 is 8929601991.

It is an interprime number because it is at equal distance from previous prime (1991069293) and next prime (1991069303).

It can be written as a sum of positive squares in 2 ways, for example, as 1689456609 + 301612689 = 41103^2 + 17367^2 .

It is not an unprimeable number, because it can be changed into a prime (1991069293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1906633 + ... + 1907676.

Almost surely, 2^1991069298 is an apocalyptic number.

1991069298 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1991069298 is an abundant number, since it is smaller than the sum of its proper divisors (2471673402).

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

1991069298 is a wasteful number, since it uses less digits than its factorization.

1991069298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814346 (or 3814343 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The square root of 1991069298 is about 44621.3995522328. The cubic root of 1991069298 is about 1258.0429217075.

The spelling of 1991069298 in words is "one billion, nine hundred ninety-one million, sixty-nine thousand, two hundred ninety-eight".