131224231 has 8 divisors (see below), whose sum is σ = 134586144. Its totient is φ = 127870080.

The previous prime is 131224229. The next prime is 131224243. The reversal of 131224231 is 132422131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131224231 - 2¹ = 131224229 is a prime.

It is a super-2 number, since 2×131224231² = 34439597603082722, 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 = 131224199 and 131224208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131224931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48835 + ... + 51451.

It is an arithmetic number, because the mean of its divisors is an integer number (16823268).

Almost surely, 2^131224231 is an apocalyptic number.

131224231 is a deficient number, since it is larger than the sum of its proper divisors (3361913).

131224231 is a wasteful number, since it uses less digits than its factorization.

131224231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3881.

The product of its digits is 288, while the sum is 19.

The square root of 131224231 is about 11455.3145308193. The cubic root of 131224231 is about 508.1649171604.

Adding to 131224231 its reverse (132422131), we get a palindrome (263646362).

The spelling of 131224231 in words is "one hundred thirty-one million, two hundred twenty-four thousand, two hundred thirty-one".