231331203202331 has 4 divisors (see below), whose sum is σ = 231331972165512. Its totient is φ = 231330434239152.

The previous prime is 231331203202279. The next prime is 231331203202343. The reversal of 231331203202331 is 133202302133132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231331203202331 is a prime.

It is a super-2 number, since 2×231331203202331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231331203202294 and 231331203202303.

It is not an unprimeable number, because it can be changed into a prime (231331203202031) 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, 384030161 + ... + 384632066.

It is an arithmetic number, because the mean of its divisors is an integer number (57832993041378).

Almost surely, 2^{231331203202331} is an apocalyptic number.

231331203202331 is a deficient number, since it is larger than the sum of its proper divisors (768963181).

231331203202331 is an equidigital number, since it uses as much as digits as its factorization.

231331203202331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768963180.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 231331203202331 its reverse (133202302133132), we get a palindrome (364533505335463).

The spelling of 231331203202331 in words is "two hundred thirty-one trillion, three hundred thirty-one billion, two hundred three million, two hundred two thousand, three hundred thirty-one".