13191211609 has 9 divisors (see below), whose sum is σ = 13510176309. Its totient is φ = 12879615420.

The previous prime is 13191211601. The next prime is 13191211613. The reversal of 13191211609 is 90611219131.

The square root of 13191211609 is 114853.

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

It is not a de Polignac number, because 13191211609 - 2³ = 13191211601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13191211601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4937344 + ... + 4940014.

It is an arithmetic number, because the mean of its divisors is an integer number (1501130701).

Almost surely, 2^13191211609 is an apocalyptic number.

13191211609 is the 114853-rd square number.

13191211609 is the 57427-th centered octagonal number.

It is an amenable number.

13191211609 is a deficient number, since it is larger than the sum of its proper divisors (318964700).

13191211609 is an frugal number, since it uses more digits than its factorization.

13191211609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 34.

Multiplying 13191211609 by its product of nonzero digits (2916), we get a square (38465573051844 = 6202062²).

The spelling of 13191211609 in words is "thirteen billion, one hundred ninety-one million, two hundred eleven thousand, six hundred nine".