131203231 has 4 divisors (see below), whose sum is σ = 131248872. Its totient is φ = 131157592.

The previous prime is 131203217. The next prime is 131203301. The reversal of 131203231 is 132302131.

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 131203231 - 2⁷ = 131203103 is a prime.

It is a super-2 number, since 2×131203231² = 34428575649678722, 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 (131207231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18196 + ... + 24361.

It is an arithmetic number, because the mean of its divisors is an integer number (32812218).

Almost surely, 2^131203231 is an apocalyptic number.

131203231 is a deficient number, since it is larger than the sum of its proper divisors (45641).

131203231 is an equidigital number, since it uses as much as digits as its factorization.

131203231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45640.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131203231 is about 11454.3978890206. The cubic root of 131203231 is about 508.1378082632.

Adding to 131203231 its reverse (132302131), we get a palindrome (263505362).

The spelling of 131203231 in words is "one hundred thirty-one million, two hundred three thousand, two hundred thirty-one".