2001098309 has 12 divisors (see below), whose sum is σ = 2344807404. Its totient is φ = 1702701504.

The previous prime is 2001098303. The next prime is 2001098327. The reversal of 2001098309 is 9038901002.

It can be written as a sum of positive squares in 2 ways, for example, as 1507147684 + 493950625 = 38822^2 + 22225^2 .

It is not a de Polignac number, because 2001098309 - 2¹² = 2001094213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001098303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142334 + ... + 155759.

It is an arithmetic number, because the mean of its divisors is an integer number (195400617).

Almost surely, 2^2001098309 is an apocalyptic number.

It is an amenable number.

2001098309 is a deficient number, since it is larger than the sum of its proper divisors (343709095).

2001098309 is a wasteful number, since it uses less digits than its factorization.

2001098309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298244 (or 298237 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2001098309 is about 44733.6373325488. The cubic root of 2001098309 is about 1260.1516381286.

The spelling of 2001098309 in words is "two billion, one million, ninety-eight thousand, three hundred nine".