9991242203 has 2 divisors, whose sum is σ = 9991242204. Its totient is φ = 9991242202.

The previous prime is 9991242199. The next prime is 9991242263. The reversal of 9991242203 is 3022421999.

It is a weak prime.

It is an emirp because it is prime and its reverse (3022421999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9991242203 - 2² = 9991242199 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991242263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995621101 + 4995621102.

It is an arithmetic number, because the mean of its divisors is an integer number (4995621102).

Almost surely, 2^9991242203 is an apocalyptic number.

9991242203 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991242203 is an equidigital number, since it uses as much as digits as its factorization.

9991242203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 9991242203 is about 99956.2014234234. The cubic root of 9991242203 is about 2153.8055696170.

The spelling of 9991242203 in words is "nine billion, nine hundred ninety-one million, two hundred forty-two thousand, two hundred three".