1098816709 has 4 divisors (see below), whose sum is σ = 1163453004. Its totient is φ = 1034180416.

The previous prime is 1098816707. The next prime is 1098816749. The reversal of 1098816709 is 9076188901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 483032484 + 615784225 = 21978^2 + 24815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098816709 - 2¹ = 1098816707 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098816701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32318122 + ... + 32318155.

It is an arithmetic number, because the mean of its divisors is an integer number (290863251).

Almost surely, 2^1098816709 is an apocalyptic number.

It is an amenable number.

1098816709 is a deficient number, since it is larger than the sum of its proper divisors (64636295).

1098816709 is an equidigital number, since it uses as much as digits as its factorization.

1098816709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64636294.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 1098816709 is about 33148.4043205702. The cubic root of 1098816709 is about 1031.9098348428.

The spelling of 1098816709 in words is "one billion, ninety-eight million, eight hundred sixteen thousand, seven hundred nine".