1231131223 has 12 divisors (see below), whose sum is σ = 1459156680. Its totient is φ = 1035342672.

The previous prime is 1231131217. The next prime is 1231131233. The reversal of 1231131223 is 3221311321.

It is not a de Polignac number, because 1231131223 - 2⁵ = 1231131191 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 1231131223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231131233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234433 + ... + 239626.

It is an arithmetic number, because the mean of its divisors is an integer number (121596390).

Almost surely, 2^1231131223 is an apocalyptic number.

1231131223 is a deficient number, since it is larger than the sum of its proper divisors (228025457).

1231131223 is an equidigital number, since it uses as much as digits as its factorization.

1231131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474126 (or 474119 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 1231131223 is about 35087.4795760539. The cubic root of 1231131223 is about 1071.7696349019.

Adding to 1231131223 its reverse (3221311321), we get a palindrome (4452442544).

It can be divided in two parts, 12311 and 31223, that added together give a palindrome (43534).

The spelling of 1231131223 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, two hundred twenty-three".