131031233 has 4 divisors (see below), whose sum is σ = 133179348. Its totient is φ = 128883120.

The previous prime is 131031227. The next prime is 131031259. The reversal of 131031233 is 332130131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 332130131 = 13093 ⋅25367.

It can be written as a sum of positive squares in 2 ways, for example, as 68178049 + 62853184 = 8257^2 + 7928^2 .

It is a cyclic number.

It is not a de Polignac number, because 131031233 - 2⁶ = 131031169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131031293) 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, 1073966 + ... + 1074087.

It is an arithmetic number, because the mean of its divisors is an integer number (33294837).

Almost surely, 2^131031233 is an apocalyptic number.

It is an amenable number.

131031233 is a deficient number, since it is larger than the sum of its proper divisors (2148115).

131031233 is an equidigital number, since it uses as much as digits as its factorization.

131031233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148114.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 131031233 is about 11446.8874808832. The cubic root of 131031233 is about 507.9156671237.

Adding to 131031233 its reverse (332130131), we get a palindrome (463161364).

The spelling of 131031233 in words is "one hundred thirty-one million, thirty-one thousand, two hundred thirty-three".