1231031223 has 16 divisors (see below), whose sum is σ = 1919737600. Its totient is φ = 777493080.

The previous prime is 1231031213. The next prime is 1231031233. The reversal of 1231031223 is 3221301321.

It is an interprime number because it is at equal distance from previous prime (1231031213) and next prime (1231031233).

It is not a de Polignac number, because 1231031223 - 2⁸ = 1231030967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231031196 and 1231031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231031203) 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, 1199323 + ... + 1200348.

It is an arithmetic number, because the mean of its divisors is an integer number (119983600).

Almost surely, 2^1231031223 is an apocalyptic number.

1231031223 is a deficient number, since it is larger than the sum of its proper divisors (688706377).

1231031223 is a wasteful number, since it uses less digits than its factorization.

1231031223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399699 (or 2399693 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231031223 is about 35086.0545373799. The cubic root of 1231031223 is about 1071.7406155568.

Adding to 1231031223 its reverse (3221301321), we get a palindrome (4452332544).

The spelling of 1231031223 in words is "one billion, two hundred thirty-one million, thirty-one thousand, two hundred twenty-three".