1001111505551 has 2 divisors, whose sum is σ = 1001111505552. Its totient is φ = 1001111505550.

The previous prime is 1001111505473. The next prime is 1001111505601. The reversal of 1001111505551 is 1555051111001.

It is a strong prime.

It is an emirp because it is prime and its reverse (1555051111001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001111505551 - 2³⁰ = 1000037763727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001111505551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001111504551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500555752775 + 500555752776.

It is an arithmetic number, because the mean of its divisors is an integer number (500555752776).

Almost surely, 2^{1001111505551} is an apocalyptic number.

1001111505551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001111505551 is an equidigital number, since it uses as much as digits as its factorization.

1001111505551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 625, while the sum is 26.

Adding to 1001111505551 its reverse (1555051111001), we get a palindrome (2556162616552).

The spelling of 1001111505551 in words is "one trillion, one billion, one hundred eleven million, five hundred five thousand, five hundred fifty-one".