11020171691 has 4 divisors (see below), whose sum is σ = 11034428832. Its totient is φ = 11005914552.

The previous prime is 11020171667. The next prime is 11020171697. The reversal of 11020171691 is 19617102011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19617102011 = 13 ⋅1509007847.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11020171691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11020171697) 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, 7127411 + ... + 7128956.

It is an arithmetic number, because the mean of its divisors is an integer number (2758607208).

Almost surely, 2^11020171691 is an apocalyptic number.

11020171691 is a deficient number, since it is larger than the sum of its proper divisors (14257141).

11020171691 is an equidigital number, since it uses as much as digits as its factorization.

11020171691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14257140.

The product of its (nonzero) digits is 756, while the sum is 29.

The spelling of 11020171691 in words is "eleven billion, twenty million, one hundred seventy-one thousand, six hundred ninety-one".