231131603 has 4 divisors (see below), whose sum is σ = 231311928. Its totient is φ = 230951280.

The previous prime is 231131597. The next prime is 231131611. The reversal of 231131603 is 306131132.

It is a happy number.

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 231131603 - 2⁴ = 231131587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231136603) 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, 88226 + ... + 90807.

It is an arithmetic number, because the mean of its divisors is an integer number (57827982).

Almost surely, 2^231131603 is an apocalyptic number.

231131603 is a deficient number, since it is larger than the sum of its proper divisors (180325).

231131603 is a wasteful number, since it uses less digits than its factorization.

231131603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180324.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 231131603 is about 15203.0129579633. The cubic root of 231131603 is about 613.6957425804.

Adding to 231131603 its reverse (306131132), we get a palindrome (537262735).

The spelling of 231131603 in words is "two hundred thirty-one million, one hundred thirty-one thousand, six hundred three".