2008991993 has 4 divisors (see below), whose sum is σ = 2009083728. Its totient is φ = 2008900260.

The previous prime is 2008991987. The next prime is 2008992043. The reversal of 2008991993 is 3991998002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2008991993 is a prime.

It is a super-2 number, since 2×2008991993² = 8072097655876224098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2008991953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8330 + ... + 63932.

It is an arithmetic number, because the mean of its divisors is an integer number (502270932).

Almost surely, 2^2008991993 is an apocalyptic number.

It is an amenable number.

2008991993 is a deficient number, since it is larger than the sum of its proper divisors (91735).

2008991993 is an equidigital number, since it uses as much as digits as its factorization.

2008991993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91734.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 2008991993 is about 44821.7803417044. The cubic root of 2008991993 is about 1261.8064273716.

The spelling of 2008991993 in words is "two billion, eight million, nine hundred ninety-one thousand, nine hundred ninety-three".