231628585 has 4 divisors (see below), whose sum is σ = 277954308. Its totient is φ = 185302864.

The previous prime is 231628583. The next prime is 231628589. The reversal of 231628585 is 585826132.

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 173686041 + 57942544 = 13179^2 + 7612^2 .

It is a cyclic number.

It is not a de Polignac number, because 231628585 - 2¹ = 231628583 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 (231628583) 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, 23162854 + ... + 23162863.

It is an arithmetic number, because the mean of its divisors is an integer number (69488577).

Almost surely, 2^231628585 is an apocalyptic number.

It is an amenable number.

231628585 is a deficient number, since it is larger than the sum of its proper divisors (46325723).

231628585 is an equidigital number, since it uses as much as digits as its factorization.

231628585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46325722.

The product of its digits is 115200, while the sum is 40.

The square root of 231628585 is about 15219.3490333851. The cubic root of 231628585 is about 614.1352863907.

The spelling of 231628585 in words is "two hundred thirty-one million, six hundred twenty-eight thousand, five hundred eighty-five".