11697071409 has 45 divisors (see below), whose sum is σ = 17855181201. Its totient is φ = 7631275680.

The previous prime is 11697071401. The next prime is 11697071413. The reversal of 11697071409 is 90417079611.

The square root of 11697071409 is 108153.

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

It can be written as a sum of positive squares in 4 ways, for example, as 17514225 + 11679557184 = 4185^2 + 108072^2 .

It is not a de Polignac number, because 11697071409 - 2³ = 11697071401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11697071401) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 59375899 + ... + 59376095.

Almost surely, 2^11697071409 is an apocalyptic number.

11697071409 is the 108153-rd square number.

11697071409 is the 54077-th centered octagonal number.

It is an amenable number.

11697071409 is a deficient number, since it is larger than the sum of its proper divisors (6158109792).

11697071409 is an frugal number, since it uses more digits than its factorization.

11697071409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The spelling of 11697071409 in words is "eleven billion, six hundred ninety-seven million, seventy-one thousand, four hundred nine".