231144444 has 36 divisors (see below), whose sum is σ = 618652944. Its totient is φ = 72515712.

The previous prime is 231144409. The next prime is 231144451. The reversal of 231144444 is 444441132.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188232 + ... + 189455.

It is an arithmetic number, because the mean of its divisors is an integer number (17184804).

Almost surely, 2^231144444 is an apocalyptic number.

It is an amenable number.

231144444 is an abundant number, since it is smaller than the sum of its proper divisors (387508500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231144444 is a wasteful number, since it uses less digits than its factorization.

231144444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377714 (or 377709 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 231144444 is about 15203.4352697014. The cubic root of 231144444 is about 613.7071074204.

Adding to 231144444 its reverse (444441132), we get a palindrome (675585576).

The spelling of 231144444 in words is "two hundred thirty-one million, one hundred forty-four thousand, four hundred forty-four".