1011002111491 has 2 divisors, whose sum is σ = 1011002111492. Its totient is φ = 1011002111490.

The previous prime is 1011002111477. The next prime is 1011002111507. The reversal of 1011002111491 is 1941112001101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011002111491 - 2¹⁷ = 1011001980419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011002111891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505501055745 + 505501055746.

It is an arithmetic number, because the mean of its divisors is an integer number (505501055746).

Almost surely, 2^{1011002111491} is an apocalyptic number.

1011002111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011002111491 is an equidigital number, since it uses as much as digits as its factorization.

1011002111491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 1011002111491 its reverse (1941112001101), we get a palindrome (2952114112592).

The spelling of 1011002111491 in words is "one trillion, eleven billion, two million, one hundred eleven thousand, four hundred ninety-one".