231220441 has 4 divisors (see below), whose sum is σ = 232498084. Its totient is φ = 229942800.

The previous prime is 231220421. The next prime is 231220453. The reversal of 231220441 is 144022132.

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 61465600 + 169754841 = 7840^2 + 13029^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220441 - 2⁷ = 231220313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638550 + ... + 638911.

It is an arithmetic number, because the mean of its divisors is an integer number (58124521).

Almost surely, 2^231220441 is an apocalyptic number.

It is an amenable number.

231220441 is a deficient number, since it is larger than the sum of its proper divisors (1277643).

231220441 is a wasteful number, since it uses less digits than its factorization.

231220441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277642.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 231220441 is about 15205.9344007529. The cubic root of 231220441 is about 613.7743594349.

Adding to 231220441 its reverse (144022132), we get a palindrome (375242573).

The spelling of 231220441 in words is "two hundred thirty-one million, two hundred twenty thousand, four hundred forty-one".