231215203 has 4 divisors (see below), whose sum is σ = 235577808. Its totient is φ = 226852600.

The previous prime is 231215189. The next prime is 231215209. The reversal of 231215203 is 302512132.

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-231215203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231215209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181223 + ... + 2181328.

It is an arithmetic number, because the mean of its divisors is an integer number (58894452).

Almost surely, 2^231215203 is an apocalyptic number.

231215203 is a deficient number, since it is larger than the sum of its proper divisors (4362605).

231215203 is an equidigital number, since it uses as much as digits as its factorization.

231215203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362604.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 231215203 is about 15205.7621643902. The cubic root of 231215203 is about 613.7697246451.

Adding to 231215203 its reverse (302512132), we get a palindrome (533727335).

The spelling of 231215203 in words is "two hundred thirty-one million, two hundred fifteen thousand, two hundred three".