11551232171 has 4 divisors (see below), whose sum is σ = 11560724952. Its totient is φ = 11541739392.

The previous prime is 11551232167. The next prime is 11551232177. The reversal of 11551232171 is 17123215511.

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

It is a cyclic number.

It is not a de Polignac number, because 11551232171 - 2² = 11551232167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11551232177) 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, 4744565 + ... + 4746998.

It is an arithmetic number, because the mean of its divisors is an integer number (2890181238).

Almost surely, 2^11551232171 is an apocalyptic number.

11551232171 is a deficient number, since it is larger than the sum of its proper divisors (9492781).

11551232171 is an equidigital number, since it uses as much as digits as its factorization.

11551232171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492780.

The product of its digits is 2100, while the sum is 29.

Adding to 11551232171 its reverse (17123215511), we get a palindrome (28674447682).

The spelling of 11551232171 in words is "eleven billion, five hundred fifty-one million, two hundred thirty-two thousand, one hundred seventy-one".