1312121323 has 8 divisors (see below), whose sum is σ = 1384632720. Its totient is φ = 1239955200.

The previous prime is 1312121311. The next prime is 1312121339. The reversal of 1312121323 is 3231212131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1312121323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312121323.

It is not an unprimeable number, because it can be changed into a prime (1312121303) 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 7 ways as a sum of consecutive naturals, for example, 78490 + ... + 93727.

It is an arithmetic number, because the mean of its divisors is an integer number (173079090).

Almost surely, 2^1312121323 is an apocalyptic number.

1312121323 is a deficient number, since it is larger than the sum of its proper divisors (72511397).

1312121323 is a wasteful number, since it uses less digits than its factorization.

1312121323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172637.

The product of its digits is 216, while the sum is 19.

The square root of 1312121323 is about 36223.2152493398. The cubic root of 1312121323 is about 1094.7744781346.

Adding to 1312121323 its reverse (3231212131), we get a palindrome (4543333454).

The spelling of 1312121323 in words is "one billion, three hundred twelve million, one hundred twenty-one thousand, three hundred twenty-three".