2097998711809 has 81 divisors (see below), whose sum is σ = 2906798227011. Its totient is φ = 1508007140640.

The previous prime is 2097998711749. The next prime is 2097998711839. The reversal of 2097998711809 is 9081178997902.

It is a happy number.

The square root of 2097998711809 is 1448447.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 310354839025 + 1787643872784 = 557095^2 + 1337028^2 .

It is not a de Polignac number, because 2097998711809 - 2²¹ = 2097996614657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2097998711839) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1449894724 + ... + 1449896170.

Almost surely, 2^{2097998711809} is an apocalyptic number.

2097998711809 is the 1448447-th square number.

2097998711809 is the 724224-th centered octagonal number.

It is an amenable number.

2097998711809 is a deficient number, since it is larger than the sum of its proper divisors (808799515202).

2097998711809 is an equidigital number, since it uses as much as digits as its factorization.

2097998711809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 70.

The spelling of 2097998711809 in words is "two trillion, ninety-seven billion, nine hundred ninety-eight million, seven hundred eleven thousand, eight hundred nine".