9991111223 has 2 divisors, whose sum is σ = 9991111224. Its totient is φ = 9991111222.

The previous prime is 9991111187. The next prime is 9991111231. The reversal of 9991111223 is 3221111999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9991111223 - 2⁶ = 9991111159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991111283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995555611 + 4995555612.

It is an arithmetic number, because the mean of its divisors is an integer number (4995555612).

Almost surely, 2^9991111223 is an apocalyptic number.

9991111223 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991111223 is an equidigital number, since it uses as much as digits as its factorization.

9991111223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 9991111223 is about 99955.5462343136. The cubic root of 9991111223 is about 2153.7961578181.

The spelling of 9991111223 in words is "nine billion, nine hundred ninety-one million, one hundred eleven thousand, two hundred twenty-three".