11211723161 has 4 divisors (see below), whose sum is σ = 11223689652. Its totient is φ = 11199756672.

The previous prime is 11211723139. The next prime is 11211723179. The reversal of 11211723161 is 16132711211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5398575625 + 5813147536 = 73475^2 + 76244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211723161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211723161.

It is not an unprimeable number, because it can be changed into a prime (11211720161) 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, 5981840 + ... + 5983713.

It is an arithmetic number, because the mean of its divisors is an integer number (2805922413).

Almost surely, 2^11211723161 is an apocalyptic number.

It is an amenable number.

11211723161 is a deficient number, since it is larger than the sum of its proper divisors (11966491).

11211723161 is an equidigital number, since it uses as much as digits as its factorization.

11211723161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11966490.

The product of its digits is 504, while the sum is 26.

The spelling of 11211723161 in words is "eleven billion, two hundred eleven million, seven hundred twenty-three thousand, one hundred sixty-one".