1231512322 has 16 divisors (see below), whose sum is σ = 2029037760. Its totient is φ = 557984592.

The previous prime is 1231512287. The next prime is 1231512323. The reversal of 1231512322 is 2232151321.

It is a junction number, because it is equal to n+sod(n) for n = 1231512293 and 1231512302.

It is not an unprimeable number, because it can be changed into a prime (1231512323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 703653 + ... + 705400.

It is an arithmetic number, because the mean of its divisors is an integer number (126814860).

Almost surely, 2^1231512322 is an apocalyptic number.

1231512322 is a deficient number, since it is larger than the sum of its proper divisors (797525438).

1231512322 is a wasteful number, since it uses less digits than its factorization.

1231512322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409097.

The product of its digits is 720, while the sum is 22.

The square root of 1231512322 is about 35092.9098537012. The cubic root of 1231512322 is about 1071.8802129324.

Adding to 1231512322 its reverse (2232151321), we get a palindrome (3463663643).

The spelling of 1231512322 in words is "one billion, two hundred thirty-one million, five hundred twelve thousand, three hundred twenty-two".