231304403 has 4 divisors (see below), whose sum is σ = 252332088. Its totient is φ = 210276720.

The previous prime is 231304379. The next prime is 231304417. The reversal of 231304403 is 304403132.

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 231304403 - 2¹⁶ = 231238867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231304433) 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, 10513826 + ... + 10513847.

It is an arithmetic number, because the mean of its divisors is an integer number (63083022).

Almost surely, 2^231304403 is an apocalyptic number.

231304403 is a deficient number, since it is larger than the sum of its proper divisors (21027685).

231304403 is a wasteful number, since it uses less digits than its factorization.

231304403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21027684.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 231304403 is about 15208.6949801750. The cubic root of 231304403 is about 613.8486427841.

Adding to 231304403 its reverse (304403132), we get a palindrome (535707535).

The spelling of 231304403 in words is "two hundred thirty-one million, three hundred four thousand, four hundred three".