231020663 has 4 divisors (see below), whose sum is σ = 231222528. Its totient is φ = 230818800.

The previous prime is 231020653. The next prime is 231020689. The reversal of 231020663 is 366020132.

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 231020663 - 2¹⁰ = 231019639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231020653) 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, 99206 + ... + 101507.

It is an arithmetic number, because the mean of its divisors is an integer number (57805632).

Almost surely, 2^231020663 is an apocalyptic number.

231020663 is a deficient number, since it is larger than the sum of its proper divisors (201865).

231020663 is a wasteful number, since it uses less digits than its factorization.

231020663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201864.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 231020663 is about 15199.3639011638. The cubic root of 231020663 is about 613.5975383528.

Adding to 231020663 its reverse (366020132), we get a palindrome (597040795).

The spelling of 231020663 in words is "two hundred thirty-one million, twenty thousand, six hundred sixty-three".