131233231 has 4 divisors (see below), whose sum is σ = 131354392. Its totient is φ = 131112072.

The previous prime is 131233229. The next prime is 131233237. The reversal of 131233231 is 132332131.

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 131233231 - 2¹ = 131233229 is a prime.

It is a super-2 number, since 2×131233231² = 34444321837398722, 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 = 131233199 and 131233208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131233237) 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, 58941 + ... + 61126.

It is an arithmetic number, because the mean of its divisors is an integer number (32838598).

Almost surely, 2^131233231 is an apocalyptic number.

131233231 is a deficient number, since it is larger than the sum of its proper divisors (121161).

131233231 is a wasteful number, since it uses less digits than its factorization.

131233231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121160.

The product of its digits is 324, while the sum is 19.

The square root of 131233231 is about 11455.7073548516. The cubic root of 131233231 is about 508.1765343739.

Adding to 131233231 its reverse (132332131), we get a palindrome (263565362).

It can be divided in two parts, 1312 and 33231, that added together give a palindrome (34543).

The spelling of 131233231 in words is "one hundred thirty-one million, two hundred thirty-three thousand, two hundred thirty-one".