1312123243 has 16 divisors (see below), whose sum is σ = 1373132160. Its totient is φ = 1252950336.

The previous prime is 1312123213. The next prime is 1312123247. The reversal of 1312123243 is 3423212131.

It is a cyclic number.

It is not a de Polignac number, because 1312123243 - 2⁹ = 1312122731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312123247) 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, 286296 + ... + 290842.

It is an arithmetic number, because the mean of its divisors is an integer number (85820760).

Almost surely, 2^1312123243 is an apocalyptic number.

1312123243 is a deficient number, since it is larger than the sum of its proper divisors (61008917).

1312123243 is an equidigital number, since it uses as much as digits as its factorization.

1312123243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746.

The product of its digits is 864, while the sum is 22.

The square root of 1312123243 is about 36223.2417516710. The cubic root of 1312123243 is about 1094.7750121213.

Adding to 1312123243 its reverse (3423212131), we get a palindrome (4735335374).

The spelling of 1312123243 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, two hundred forty-three".