231867216 has 180 divisors, whose sum is σ = 799666452. Its totient is φ = 62318592.

The previous prime is 231867193. The next prime is 231867217. The reversal of 231867216 is 612768132.

It can be written as a sum of positive squares in 2 ways, for example, as 169520400 + 62346816 = 13020^2 + 7896^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231867217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 118986 + ... + 120918.

Almost surely, 2^231867216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231867216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399833226).

231867216 is an abundant number, since it is smaller than the sum of its proper divisors (567799236).

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

231867216 is a wasteful number, since it uses less digits than its factorization.

231867216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1962 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 231867216 is about 15227.1867395130. The cubic root of 231867216 is about 614.3461144555.

The spelling of 231867216 in words is "two hundred thirty-one million, eight hundred sixty-seven thousand, two hundred sixteen".