231220232 has 8 divisors (see below), whose sum is σ = 433537950. Its totient is φ = 115610112.

The previous prime is 231220229. The next prime is 231220237. The reversal of 231220232 is 232022132.

231220232 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 227587396 + 3632836 = 15086^2 + 1906^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×231220232² = 106925591372267648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231220232.

It is not an unprimeable number, because it can be changed into a prime (231220237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14451257 + ... + 14451272.

Almost surely, 2^231220232 is an apocalyptic number.

It is an amenable number.

231220232 is a deficient number, since it is larger than the sum of its proper divisors (202317718).

231220232 is a wasteful number, since it uses less digits than its factorization.

231220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28902535 (or 28902531 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 231220232 is about 15205.9275284344. The cubic root of 231220232 is about 613.7741745047.

Adding to 231220232 its reverse (232022132), we get a palindrome (463242364).

The spelling of 231220232 in words is "two hundred thirty-one million, two hundred twenty thousand, two hundred thirty-two".