10002011991 has 4 divisors (see below), whose sum is σ = 13336015992. Its totient is φ = 6668007992.

The previous prime is 10002011963. The next prime is 10002012011. The reversal of 10002011991 is 19911020001.

10002011991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10002011991 - 2¹¹ = 10002009943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002011191) 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 3 ways as a sum of consecutive naturals, for example, 1667001996 + ... + 1667002001.

It is an arithmetic number, because the mean of its divisors is an integer number (3334003998).

Almost surely, 2^10002011991 is an apocalyptic number.

10002011991 is a deficient number, since it is larger than the sum of its proper divisors (3334004001).

10002011991 is an equidigital number, since it uses as much as digits as its factorization.

10002011991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334004000.

The product of its (nonzero) digits is 162, while the sum is 24.

Adding to 10002011991 its reverse (19911020001), we get a palindrome (29913031992).

The spelling of 10002011991 in words is "ten billion, two million, eleven thousand, nine hundred ninety-one".