131311231 has 4 divisors (see below), whose sum is σ = 131413464. Its totient is φ = 131209000.

The previous prime is 131311199. The next prime is 131311241. The reversal of 131311231 is 132113131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132113131 = 8297 ⋅15923.

It is a cyclic number.

It is not a de Polignac number, because 131311231 - 2⁵ = 131311199 is a prime.

It is a super-2 number, since 2×131311231² = 34485278773470722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131311241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49165 + ... + 51766.

It is an arithmetic number, because the mean of its divisors is an integer number (32853366).

Almost surely, 2^131311231 is an apocalyptic number.

131311231 is a deficient number, since it is larger than the sum of its proper divisors (102233).

131311231 is a wasteful number, since it uses less digits than its factorization.

131311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102232.

The product of its digits is 54, while the sum is 16.

The square root of 131311231 is about 11459.1112657134. Note that the first 3 decimals coincide. The cubic root of 131311231 is about 508.2771946485.

Adding to 131311231 its reverse (132113131), we get a palindrome (263424362).

It can be divided in two parts, 1313 and 11231, that added together give a square (12544 = 112²).

The spelling of 131311231 in words is "one hundred thirty-one million, three hundred eleven thousand, two hundred thirty-one".