231213403 has 8 divisors (see below), whose sum is σ = 232386048. Its totient is φ = 230044584.

The previous prime is 231213397. The next prime is 231213439. The reversal of 231213403 is 304312132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231213403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231213443) 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 7 ways as a sum of consecutive naturals, for example, 260226 + ... + 261112.

It is an arithmetic number, because the mean of its divisors is an integer number (29048256).

Almost surely, 2^231213403 is an apocalyptic number.

231213403 is a deficient number, since it is larger than the sum of its proper divisors (1172645).

231213403 is an equidigital number, since it uses as much as digits as its factorization.

231213403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231213403 is about 15205.7029761863. The cubic root of 231213403 is about 613.7681319177.

Adding to 231213403 its reverse (304312132), we get a palindrome (535525535).

The spelling of 231213403 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred three".