231144985 has 4 divisors (see below), whose sum is σ = 277373988. Its totient is φ = 184915984.

The previous prime is 231144983. The next prime is 231145069. The reversal of 231144985 is 589441132.

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 165405321 + 65739664 = 12861^2 + 8108^2 .

It is a cyclic number.

It is not a de Polignac number, because 231144985 - 2¹ = 231144983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231144983) 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, 23114494 + ... + 23114503.

It is an arithmetic number, because the mean of its divisors is an integer number (69343497).

Almost surely, 2^231144985 is an apocalyptic number.

It is an amenable number.

231144985 is a deficient number, since it is larger than the sum of its proper divisors (46229003).

231144985 is an equidigital number, since it uses as much as digits as its factorization.

231144985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46229002.

The product of its digits is 34560, while the sum is 37.

The square root of 231144985 is about 15203.4530617225. The cubic root of 231144985 is about 613.7075862196.

The spelling of 231144985 in words is "two hundred thirty-one million, one hundred forty-four thousand, nine hundred eighty-five".