231216144 has 20 divisors (see below), whose sum is σ = 597308496. Its totient is φ = 77072032.

The previous prime is 231216143. The next prime is 231216191. The reversal of 231216144 is 441612132.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is not an unprimeable number, because it can be changed into a prime (231216143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2408454 + ... + 2408549.

Almost surely, 2^231216144 is an apocalyptic number.

231216144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231216144 is an abundant number, since it is smaller than the sum of its proper divisors (366092352).

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

231216144 is a wasteful number, since it uses less digits than its factorization.

231216144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817014 (or 4817008 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 231216144 is about 15205.7931065762. The cubic root of 231216144 is about 613.7705572843.

Adding to 231216144 its reverse (441612132), we get a palindrome (672828276).

The spelling of 231216144 in words is "two hundred thirty-one million, two hundred sixteen thousand, one hundred forty-four".