1991596233 has 24 divisors (see below), whose sum is σ = 2922271744. Its totient is φ = 1205598240.

The previous prime is 1991596231. The next prime is 1991596237. The reversal of 1991596233 is 3326951991.

It is not a de Polignac number, because 1991596233 - 2¹ = 1991596231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1991596231) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 359160 + ... + 364662.

Almost surely, 2^1991596233 is an apocalyptic number.

It is an amenable number.

1991596233 is a deficient number, since it is larger than the sum of its proper divisors (930675511).

1991596233 is a wasteful number, since it uses less digits than its factorization.

1991596233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525 (or 6514 counting only the distinct ones).

The product of its digits is 393660, while the sum is 48.

The square root of 1991596233 is about 44627.3036716313. The cubic root of 1991596233 is about 1258.1538919580.

The spelling of 1991596233 in words is "one billion, nine hundred ninety-one million, five hundred ninety-six thousand, two hundred thirty-three".