231243636 has 48 divisors (see below), whose sum is σ = 596793344. Its totient is φ = 69227136.

The previous prime is 231243631. The next prime is 231243647. The reversal of 231243636 is 636342132.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231243631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14260 + ... + 25803.

Almost surely, 2^231243636 is an apocalyptic number.

231243636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

231243636 is an abundant number, since it is smaller than the sum of its proper divisors (365549708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231243636 is a wasteful number, since it uses less digits than its factorization.

231243636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40120 (or 40118 counting only the distinct ones).

The product of its digits is 15552, while the sum is 30.

The square root of 231243636 is about 15206.6970772749. The cubic root of 231243636 is about 613.7948824477.

Adding to 231243636 its reverse (636342132), we get a palindrome (867585768).

The spelling of 231243636 in words is "two hundred thirty-one million, two hundred forty-three thousand, six hundred thirty-six".