1099985729 has 2 divisors, whose sum is σ = 1099985730. Its totient is φ = 1099985728.

The previous prime is 1099985717. The next prime is 1099985743. The reversal of 1099985729 is 9275899901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 757735729 + 342250000 = 27527^2 + 18500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099985729 - 2⁴ = 1099985713 is a prime.

It is a super-2 number, since 2×1099985729² = 2419937208007322882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1099985759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549992864 + 549992865.

It is an arithmetic number, because the mean of its divisors is an integer number (549992865).

Almost surely, 2^1099985729 is an apocalyptic number.

It is an amenable number.

1099985729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099985729 is an equidigital number, since it uses as much as digits as its factorization.

1099985729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 59.

The square root of 1099985729 is about 33166.0327594363. The cubic root of 1099985729 is about 1032.2756512948.

The spelling of 1099985729 in words is "one billion, ninety-nine million, nine hundred eighty-five thousand, seven hundred twenty-nine".