10209999991 has 2 divisors, whose sum is σ = 10209999992. Its totient is φ = 10209999990.

The previous prime is 10209999971. The next prime is 10210000051. The reversal of 10209999991 is 19999990201.

It is a weak prime.

It is an emirp because it is prime and its reverse (19999990201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10209999991 - 2⁵ = 10209999959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10209999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104999995 + 5104999996.

It is an arithmetic number, because the mean of its divisors is an integer number (5104999996).

Almost surely, 2^10209999991 is an apocalyptic number.

10209999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10209999991 is an equidigital number, since it uses as much as digits as its factorization.

10209999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1062882, while the sum is 58.

The spelling of 10209999991 in words is "ten billion, two hundred nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".