131118231 has 4 divisors (see below), whose sum is σ = 174824312. Its totient is φ = 87412152.

The previous prime is 131118209. The next prime is 131118241. The reversal of 131118231 is 132811131.

It is a happy number.

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

It is not a de Polignac number, because 131118231 - 2⁵ = 131118199 is a prime.

It is a super-2 number, since 2×131118231² = 34383981001138722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131118198 and 131118207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131118241) 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, 21853036 + ... + 21853041.

It is an arithmetic number, because the mean of its divisors is an integer number (43706078).

Almost surely, 2^131118231 is an apocalyptic number.

131118231 is a deficient number, since it is larger than the sum of its proper divisors (43706081).

131118231 is an equidigital number, since it uses as much as digits as its factorization.

131118231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43706080.

The product of its digits is 144, while the sum is 21.

The square root of 131118231 is about 11450.6869226261. The cubic root of 131118231 is about 508.0280522153.

Adding to 131118231 its reverse (132811131), we get a palindrome (263929362).

The spelling of 131118231 in words is "one hundred thirty-one million, one hundred eighteen thousand, two hundred thirty-one".