1099965989 has 2 divisors, whose sum is σ = 1099965990. Its totient is φ = 1099965988.

The previous prime is 1099965967. The next prime is 1099965991. The reversal of 1099965989 is 9895699901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053521764 + 46444225 = 32458^2 + 6815^2 .

It is an emirp because it is prime and its reverse (9895699901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1099965989 is a prime.

Together with 1099965991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1099965949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549982994 + 549982995.

It is an arithmetic number, because the mean of its divisors is an integer number (549982995).

Almost surely, 2^1099965989 is an apocalyptic number.

It is an amenable number.

1099965989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099965989 is an equidigital number, since it uses as much as digits as its factorization.

1099965989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14171760, while the sum is 65.

The square root of 1099965989 is about 33165.7351644736. The cubic root of 1099965989 is about 1032.2694762925.

The spelling of 1099965989 in words is "one billion, ninety-nine million, nine hundred sixty-five thousand, nine hundred eighty-nine".