12200001991 has 2 divisors, whose sum is σ = 12200001992. Its totient is φ = 12200001990.

The previous prime is 12200001977. The next prime is 12200002037. The reversal of 12200001991 is 19910000221.

It is a weak prime.

It is an emirp because it is prime and its reverse (19910000221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12200001991 - 2¹¹ = 12199999943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12200001691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100000995 + 6100000996.

It is an arithmetic number, because the mean of its divisors is an integer number (6100000996).

Almost surely, 2^12200001991 is an apocalyptic number.

12200001991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12200001991 is an equidigital number, since it uses as much as digits as its factorization.

12200001991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 12200001991 in words is "twelve billion, two hundred million, one thousand, nine hundred ninety-one".