1231131224 has 16 divisors (see below), whose sum is σ = 2316956400. Its totient is φ = 613276192.

The previous prime is 1231131217. The next prime is 1231131233. The reversal of 1231131224 is 4221311321.

It is a junction number, because it is equal to n+sod(n) for n = 1231131196 and 1231131205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283892 + ... + 288195.

It is an arithmetic number, because the mean of its divisors is an integer number (144809775).

Almost surely, 2^1231131224 is an apocalyptic number.

It is an amenable number.

1231131224 is a deficient number, since it is larger than the sum of its proper divisors (1085825176).

1231131224 is a wasteful number, since it uses less digits than its factorization.

1231131224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572362 (or 572358 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1231131224 is about 35087.4795903040. The cubic root of 1231131224 is about 1071.7696351921.

Adding to 1231131224 its reverse (4221311321), we get a palindrome (5452442545).

The spelling of 1231131224 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, two hundred twenty-four".