231445 has 8 divisors (see below), whose sum is σ = 284760. Its totient is φ = 180480.

The previous prime is 231443. The next prime is 231461. The reversal of 231445 is 544132.

It can be written as a sum of positive squares in 4 ways, for example, as 9604 + 221841 = 98^2 + 471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231445 - 2¹ = 231443 is a prime.

It is a super-3 number, since 3×231445³ = 37193295763338375, which contains 333 as substring.

231445 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360 + ... + 769.

It is an arithmetic number, because the mean of its divisors is an integer number (35595).

2²³¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

231445 is a deficient number, since it is larger than the sum of its proper divisors (53315).

231445 is a wasteful number, since it uses less digits than its factorization.

231445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175.

The product of its digits is 480, while the sum is 19.

The square root of 231445 is about 481.0873101631. The cubic root of 231445 is about 61.3972992336.

Adding to 231445 its reverse (544132), we get a palindrome (775577).

It can be divided in two parts, 231 and 445, that added together give a palindrome (676).

The spelling of 231445 in words is "two hundred thirty-one thousand, four hundred forty-five".