231145441 has 4 divisors (see below), whose sum is σ = 232832772. Its totient is φ = 229458112.

The previous prime is 231145433. The next prime is 231145451. The reversal of 231145441 is 144541132.

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 98089216 + 133056225 = 9904^2 + 11535^2 .

It is a cyclic number.

It is not a de Polignac number, because 231145441 - 2³ = 231145433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231145451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843460 + ... + 843733.

It is an arithmetic number, because the mean of its divisors is an integer number (58208193).

Almost surely, 2^231145441 is an apocalyptic number.

It is an amenable number.

231145441 is a deficient number, since it is larger than the sum of its proper divisors (1687331).

231145441 is a wasteful number, since it uses less digits than its factorization.

231145441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687330.

The product of its digits is 1920, while the sum is 25.

The square root of 231145441 is about 15203.4680583083. The cubic root of 231145441 is about 613.7079897909.

Adding to 231145441 its reverse (144541132), we get a palindrome (375686573).

The spelling of 231145441 in words is "two hundred thirty-one million, one hundred forty-five thousand, four hundred forty-one".