1891911000011 has 2 divisors, whose sum is σ = 1891911000012. Its totient is φ = 1891911000010.

The previous prime is 1891910999999. The next prime is 1891911000079. The reversal of 1891911000011 is 1100001191981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891911000011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1891911000611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945955500005 + 945955500006.

It is an arithmetic number, because the mean of its divisors is an integer number (945955500006).

Almost surely, 2^{1891911000011} is an apocalyptic number.

1891911000011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891911000011 is an equidigital number, since it uses as much as digits as its factorization.

1891911000011 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.

Adding to 1891911000011 its reverse (1100001191981), we get a palindrome (2991912191992).

The spelling of 1891911000011 in words is "one trillion, eight hundred ninety-one billion, nine hundred eleven million, eleven", and thus it is an aban number.