1531231323 has 16 divisors (see below), whose sum is σ = 2051597856. Its totient is φ = 1015856640.

The previous prime is 1531231301. The next prime is 1531231343. The reversal of 1531231323 is 3231321351.

It is not a de Polignac number, because 1531231323 - 2¹⁸ = 1530969179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1531231293 and 1531231302.

It is not an unprimeable number, because it can be changed into a prime (1531231343) 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, 597561 + ... + 600117.

It is an arithmetic number, because the mean of its divisors is an integer number (128224866).

Almost surely, 2^1531231323 is an apocalyptic number.

1531231323 is a deficient number, since it is larger than the sum of its proper divisors (520366533).

1531231323 is a wasteful number, since it uses less digits than its factorization.

1531231323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454.

The product of its digits is 1620, while the sum is 24.

The square root of 1531231323 is about 39130.9509595665. The cubic root of 1531231323 is about 1152.6043867850.

Adding to 1531231323 its reverse (3231321351), we get a palindrome (4762552674).

The spelling of 1531231323 in words is "one billion, five hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-three".