231197665 has 4 divisors (see below), whose sum is σ = 277437204. Its totient is φ = 184958128.

The previous prime is 231197663. The next prime is 231197677. The reversal of 231197665 is 566791132.

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 35533521 + 195664144 = 5961^2 + 13988^2 .

It is a cyclic number.

It is not a de Polignac number, because 231197665 - 2¹ = 231197663 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231197663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23119762 + ... + 23119771.

It is an arithmetic number, because the mean of its divisors is an integer number (69359301).

Almost surely, 2^231197665 is an apocalyptic number.

It is an amenable number.

231197665 is a deficient number, since it is larger than the sum of its proper divisors (46239539).

231197665 is an equidigital number, since it uses as much as digits as its factorization.

231197665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46239538.

The product of its digits is 68040, while the sum is 40.

The square root of 231197665 is about 15205.1854641764. The cubic root of 231197665 is about 613.7542058190.

The spelling of 231197665 in words is "two hundred thirty-one million, one hundred ninety-seven thousand, six hundred sixty-five".