10101009991 has 2 divisors, whose sum is σ = 10101009992. Its totient is φ = 10101009990.

The previous prime is 10101009983. The next prime is 10101010009. The reversal of 10101009991 is 19990010101.

It is a weak prime.

It is an emirp because it is prime and its reverse (19990010101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10101009991 - 2³ = 10101009983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10101009491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050504995 + 5050504996.

It is an arithmetic number, because the mean of its divisors is an integer number (5050504996).

Almost surely, 2^10101009991 is an apocalyptic number.

10101009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10101009991 is an equidigital number, since it uses as much as digits as its factorization.

10101009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 10101009991 in words is "ten billion, one hundred one million, nine thousand, nine hundred ninety-one".