1099999122881 has 2 divisors, whose sum is σ = 1099999122882. Its totient is φ = 1099999122880.

The previous prime is 1099999122857. The next prime is 1099999122967. The reversal of 1099999122881 is 1882219999901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708022956481 + 391976166400 = 841441^2 + 626080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1099999122881 is a prime.

It is a super-2 number, since 2×1099999122881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1099999122281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549999561440 + 549999561441.

It is an arithmetic number, because the mean of its divisors is an integer number (549999561441).

Almost surely, 2^{1099999122881} is an apocalyptic number.

It is an amenable number.

1099999122881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099999122881 is an equidigital number, since it uses as much as digits as its factorization.

1099999122881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15116544, while the sum is 68.

The spelling of 1099999122881 in words is "one trillion, ninety-nine billion, nine hundred ninety-nine million, one hundred twenty-two thousand, eight hundred eighty-one".