231220266 has 8 divisors (see below), whose sum is σ = 462440544. Its totient is φ = 77073420.

The previous prime is 231220237. The next prime is 231220267. The reversal of 231220266 is 662022132.

It is a sphenic number, since it is the product of 3 distinct primes.

231220266 is an admirable number.

It is a super-2 number, since 2×231220266² = 106925622818221512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231220267) 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 3 ways as a sum of consecutive naturals, for example, 19268350 + ... + 19268361.

It is an arithmetic number, because the mean of its divisors is an integer number (57805068).

Almost surely, 2^231220266 is an apocalyptic number.

231220266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

231220266 is a wasteful number, since it uses less digits than its factorization.

231220266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38536716.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 231220266 is about 15205.9286464195. The cubic root of 231220266 is about 613.7742045891.

Adding to 231220266 its reverse (662022132), we get a palindrome (893242398).

It can be divided in two parts, 2312 and 20266, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 231220266 in words is "two hundred thirty-one million, two hundred twenty thousand, two hundred sixty-six".