1231220223 has 16 divisors (see below), whose sum is σ = 1931326560. Its totient is φ = 772530048.

The previous prime is 1231220209. The next prime is 1231220239. The reversal of 1231220223 is 3220221321.

It is not a de Polignac number, because 1231220223 - 2⁸ = 1231219967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231220196 and 1231220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231220203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1340740 + ... + 1341657.

It is an arithmetic number, because the mean of its divisors is an integer number (120707910).

Almost surely, 2^1231220223 is an apocalyptic number.

1231220223 is a deficient number, since it is larger than the sum of its proper divisors (700106337).

1231220223 is a wasteful number, since it uses less digits than its factorization.

1231220223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682423 (or 2682417 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1231220223 is about 35088.7478117986. The cubic root of 1231220223 is about 1071.7954607974.

Adding to 1231220223 its reverse (3220221321), we get a palindrome (4451441544).

The spelling of 1231220223 in words is "one billion, two hundred thirty-one million, two hundred twenty thousand, two hundred twenty-three".