11172171105 has 32 divisors (see below), whose sum is σ = 19871913600. Its totient is φ = 5955408576.

The previous prime is 11172171089. The next prime is 11172171107. The reversal of 11172171105 is 50117127111.

It is a happy number.

It is not a de Polignac number, because 11172171105 - 2⁴ = 11172171089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11172171107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253522 + ... + 294308.

It is an arithmetic number, because the mean of its divisors is an integer number (620997300).

Almost surely, 2^11172171105 is an apocalyptic number.

11172171105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11172171105 is a deficient number, since it is larger than the sum of its proper divisors (8699742495).

11172171105 is a wasteful number, since it uses less digits than its factorization.

11172171105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42830 (or 42824 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 27.

Adding to 11172171105 its reverse (50117127111), we get a palindrome (61289298216).

The spelling of 11172171105 in words is "eleven billion, one hundred seventy-two million, one hundred seventy-one thousand, one hundred five".