231145636 has 12 divisors (see below), whose sum is σ = 404700912. Its totient is φ = 115516808.

The previous prime is 231145609. The next prime is 231145643. The reversal of 231145636 is 636541132.

It is a junction number, because it is equal to n+sod(n) for n = 231145598 and 231145607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3910 + ... + 21853.

It is an arithmetic number, because the mean of its divisors is an integer number (33725076).

Almost surely, 2^231145636 is an apocalyptic number.

It is an amenable number.

231145636 is a deficient number, since it is larger than the sum of its proper divisors (173555276).

231145636 is a wasteful number, since it uses less digits than its factorization.

231145636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28010 (or 28008 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 231145636 is about 15203.4744713174. The cubic root of 231145636 is about 613.7081623706.

Adding to 231145636 its reverse (636541132), we get a palindrome (867686768).

The spelling of 231145636 in words is "two hundred thirty-one million, one hundred forty-five thousand, six hundred thirty-six".