11171531879 has 4 divisors (see below), whose sum is σ = 11171838120. Its totient is φ = 11171225640.

The previous prime is 11171531863. The next prime is 11171531909. The reversal of 11171531879 is 97813517111.

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 11171531879 - 2⁴ = 11171531863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11171531179) 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, 89624 + ... + 174285.

It is an arithmetic number, because the mean of its divisors is an integer number (2792959530).

Almost surely, 2^11171531879 is an apocalyptic number.

11171531879 is a deficient number, since it is larger than the sum of its proper divisors (306241).

11171531879 is an equidigital number, since it uses as much as digits as its factorization.

11171531879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306240.

The product of its digits is 52920, while the sum is 44.

The spelling of 11171531879 in words is "eleven billion, one hundred seventy-one million, five hundred thirty-one thousand, eight hundred seventy-nine".