1001312105491 has 2 divisors, whose sum is σ = 1001312105492. Its totient is φ = 1001312105490.

The previous prime is 1001312105293. The next prime is 1001312105609. The reversal of 1001312105491 is 1945012131001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001312105491 - 2¹⁷ = 1001311974419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001312105291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500656052745 + 500656052746.

It is an arithmetic number, because the mean of its divisors is an integer number (500656052746).

Almost surely, 2^{1001312105491} is an apocalyptic number.

1001312105491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001312105491 is an equidigital number, since it uses as much as digits as its factorization.

1001312105491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

Adding to 1001312105491 its reverse (1945012131001), we get a palindrome (2946324236492).

The spelling of 1001312105491 in words is "one trillion, one billion, three hundred twelve million, one hundred five thousand, four hundred ninety-one".