991022111000111 has 2 divisors, whose sum is σ = 991022111000112. Its totient is φ = 991022111000110.

The previous prime is 991022110999969. The next prime is 991022111000153. The reversal of 991022111000111 is 111000111220199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991022111000111 - 2¹⁰ = 991022110999087 is a prime.

It is a super-2 number, since 2×991022111000111² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991022111000161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495511055500055 + 495511055500056.

It is an arithmetic number, because the mean of its divisors is an integer number (495511055500056).

Almost surely, 2^{991022111000111} is an apocalyptic number.

991022111000111 is a deficient number, since it is larger than the sum of its proper divisors (1).

991022111000111 is an equidigital number, since it uses as much as digits as its factorization.

991022111000111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 29.

The spelling of 991022111000111 in words is "nine hundred ninety-one trillion, twenty-two billion, one hundred eleven million, one hundred eleven", and thus it is an aban number.