1111001009891 has 2 divisors, whose sum is σ = 1111001009892. Its totient is φ = 1111001009890.

The previous prime is 1111001009861. The next prime is 1111001010017. The reversal of 1111001009891 is 1989001001111.

It is a weak prime.

It is an emirp because it is prime and its reverse (1989001001111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1111001009891 - 2⁶ = 1111001009827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111001009831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555500504945 + 555500504946.

It is an arithmetic number, because the mean of its divisors is an integer number (555500504946).

Almost surely, 2^{1111001009891} is an apocalyptic number.

1111001009891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111001009891 is an equidigital number, since it uses as much as digits as its factorization.

1111001009891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 32.

The spelling of 1111001009891 in words is "one trillion, one hundred eleven billion, one million, nine thousand, eight hundred ninety-one".