231065563 has 4 divisors (see below), whose sum is σ = 231400648. Its totient is φ = 230730480.

The previous prime is 231065557. The next prime is 231065579. The reversal of 231065563 is 365560132.

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 231065563 - 2¹⁷ = 230934491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231065663) 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, 166506 + ... + 167887.

It is an arithmetic number, because the mean of its divisors is an integer number (57850162).

Almost surely, 2^231065563 is an apocalyptic number.

231065563 is a deficient number, since it is larger than the sum of its proper divisors (335085).

231065563 is an equidigital number, since it uses as much as digits as its factorization.

231065563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335084.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 231065563 is about 15200.8408648995. The cubic root of 231065563 is about 613.6372876757.

The spelling of 231065563 in words is "two hundred thirty-one million, sixty-five thousand, five hundred sixty-three".