1231331223 has 16 divisors (see below), whose sum is σ = 1672215296. Its totient is φ = 805775040.

The previous prime is 1231331221. The next prime is 1231331263. The reversal of 1231331223 is 3221331321.

It is not a de Polignac number, because 1231331223 - 2¹ = 1231331221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231331223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231331221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32886 + ... + 59532.

It is an arithmetic number, because the mean of its divisors is an integer number (104513456).

Almost surely, 2^1231331223 is an apocalyptic number.

1231331223 is a deficient number, since it is larger than the sum of its proper divisors (440884073).

1231331223 is a wasteful number, since it uses less digits than its factorization.

1231331223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26934.

The product of its digits is 648, while the sum is 21.

The square root of 1231331223 is about 35090.3294797869. The cubic root of 1231331223 is about 1071.8276688782.

Adding to 1231331223 its reverse (3221331321), we get a palindrome (4452662544).

The spelling of 1231331223 in words is "one billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-three".