231326665 has 4 divisors (see below), whose sum is σ = 277592004. Its totient is φ = 185061328.

The previous prime is 231326651. The next prime is 231326671. The reversal of 231326665 is 566623132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71961289 + 159365376 = 8483^2 + 12624^2 .

It is a cyclic number.

It is not a de Polignac number, because 231326665 - 2⁹ = 231326153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231326665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23132662 + ... + 23132671.

It is an arithmetic number, because the mean of its divisors is an integer number (69398001).

Almost surely, 2^231326665 is an apocalyptic number.

It is an amenable number.

231326665 is a deficient number, since it is larger than the sum of its proper divisors (46265339).

231326665 is an equidigital number, since it uses as much as digits as its factorization.

231326665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46265338.

The product of its digits is 38880, while the sum is 34.

The square root of 231326665 is about 15209.4268465317. The cubic root of 231326665 is about 613.8683355352.

Adding to 231326665 its reverse (566623132), we get a palindrome (797949797).

The spelling of 231326665 in words is "two hundred thirty-one million, three hundred twenty-six thousand, six hundred sixty-five".