231220231 has 6 divisors (see below), whose sum is σ = 254151296. Its totient is φ = 210200100.

The previous prime is 231220229. The next prime is 231220237. The reversal of 231220231 is 132022132.

It is not a de Polignac number, because 231220231 - 2¹ = 231220229 is a prime.

It is a super-2 number, since 2×231220231² = 106925590447386722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220237) 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 5 ways as a sum of consecutive naturals, for example, 955335 + ... + 955576.

Almost surely, 2^231220231 is an apocalyptic number.

231220231 is a deficient number, since it is larger than the sum of its proper divisors (22931065).

231220231 is a wasteful number, since it uses less digits than its factorization.

231220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910933 (or 1910922 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231220231 is about 15205.9274955525. The cubic root of 231220231 is about 613.7741736199.

Adding to 231220231 its reverse (132022132), we get a palindrome (363242363).

The spelling of 231220231 in words is "two hundred thirty-one million, two hundred twenty thousand, two hundred thirty-one".