1312312321 has 8 divisors (see below), whose sum is σ = 1371562920. Its totient is φ = 1253995008.

The previous prime is 1312312259. The next prime is 1312312327. The reversal of 1312312321 is 1232132131.

It can be written as a sum of positive squares in 4 ways, for example, as 497780721 + 814531600 = 22311^2 + 28540^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1312312321 - 2²³ = 1303923713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312312327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230446 + ... + 236071.

It is an arithmetic number, because the mean of its divisors is an integer number (171445365).

Almost surely, 2^1312312321 is an apocalyptic number.

It is an amenable number.

1312312321 is a deficient number, since it is larger than the sum of its proper divisors (59250599).

1312312321 is an equidigital number, since it uses as much as digits as its factorization.

1312312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466643.

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

The square root of 1312312321 is about 36225.8515565887. The cubic root of 1312312321 is about 1094.8275955781.

Adding to 1312312321 its reverse (1232132131), we get a palindrome (2544444452).

The spelling of 1312312321 in words is "one billion, three hundred twelve million, three hundred twelve thousand, three hundred twenty-one".