1111111102891 has 2 divisors, whose sum is σ = 1111111102892. Its totient is φ = 1111111102890.

The previous prime is 1111111102853. The next prime is 1111111102919. The reversal of 1111111102891 is 1982011111111.

It is an a-pointer prime, because the next prime (1111111102919) can be obtained adding 1111111102891 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1111111102891 - 2¹³ = 1111111094699 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111111132891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555555551445 + 555555551446.

It is an arithmetic number, because the mean of its divisors is an integer number (555555551446).

Almost surely, 2^{1111111102891} is an apocalyptic number.

1111111102891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111111102891 is an equidigital number, since it uses as much as digits as its factorization.

1111111102891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 28.

The spelling of 1111111102891 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred two thousand, eight hundred ninety-one".