231213565 has 32 divisors (see below), whose sum is σ = 322035840. Its totient is φ = 157593600.

The previous prime is 231213551. The next prime is 231213571. The reversal of 231213565 is 565312132.

It is not a de Polignac number, because 231213565 - 2⁹ = 231213053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100225 + ... + 102505.

It is an arithmetic number, because the mean of its divisors is an integer number (10063620).

Almost surely, 2^231213565 is an apocalyptic number.

It is an amenable number.

231213565 is a deficient number, since it is larger than the sum of its proper divisors (90822275).

231213565 is a wasteful number, since it uses less digits than its factorization.

231213565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413.

The product of its digits is 5400, while the sum is 28.

The square root of 231213565 is about 15205.7083031341. The cubic root of 231213565 is about 613.7682752635.

Adding to 231213565 its reverse (565312132), we get a palindrome (796525697).

The spelling of 231213565 in words is "two hundred thirty-one million, two hundred thirteen thousand, five hundred sixty-five".