1321312013 has 4 divisors (see below), whose sum is σ = 1510070880. Its totient is φ = 1132553148.

The previous prime is 1321312009. The next prime is 1321312049. The reversal of 1321312013 is 3102131231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321312013 - 2² = 1321312009 is a prime.

It is a super-2 number, since 2×1321312013² = 3491730871396224338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321311982 and 1321312000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321312093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94379423 + ... + 94379436.

It is an arithmetic number, because the mean of its divisors is an integer number (377517720).

Almost surely, 2^1321312013 is an apocalyptic number.

It is an amenable number.

1321312013 is a deficient number, since it is larger than the sum of its proper divisors (188758867).

1321312013 is an equidigital number, since it uses as much as digits as its factorization.

1321312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188758866.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1321312013 is about 36349.8557493699. The cubic root of 1321312013 is about 1097.3246314267.

Adding to 1321312013 its reverse (3102131231), we get a palindrome (4423443244).

The spelling of 1321312013 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, thirteen".