231144403 has 4 divisors (see below), whose sum is σ = 264165040. Its totient is φ = 198123768.

The previous prime is 231144383. The next prime is 231144409. The reversal of 231144403 is 304441132.

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-231144403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231144409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16510308 + ... + 16510321.

It is an arithmetic number, because the mean of its divisors is an integer number (66041260).

Almost surely, 2^231144403 is an apocalyptic number.

231144403 is a deficient number, since it is larger than the sum of its proper divisors (33020637).

231144403 is an equidigital number, since it uses as much as digits as its factorization.

231144403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33020636.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 231144403 is about 15203.4339213219. The cubic root of 231144403 is about 613.7070711343.

Adding to 231144403 its reverse (304441132), we get a palindrome (535585535).

The spelling of 231144403 in words is "two hundred thirty-one million, one hundred forty-four thousand, four hundred three".