321370613 has 4 divisors (see below), whose sum is σ = 321424908. Its totient is φ = 321316320.

The previous prime is 321370607. The next prime is 321370649. The reversal of 321370613 is 316073123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316073123 = 971 ⋅325513.

It can be written as a sum of positive squares in 2 ways, for example, as 302168689 + 19201924 = 17383^2 + 4382^2 .

It is a cyclic number.

It is not a de Polignac number, because 321370613 - 2⁴ = 321370597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321370213) 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, 17006 + ... + 30527.

It is an arithmetic number, because the mean of its divisors is an integer number (80356227).

Almost surely, 2^321370613 is an apocalyptic number.

It is an amenable number.

321370613 is a deficient number, since it is larger than the sum of its proper divisors (54295).

321370613 is an equidigital number, since it uses as much as digits as its factorization.

321370613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54294.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 321370613 is about 17926.8126837985. The cubic root of 321370613 is about 684.9655357658.

The spelling of 321370613 in words is "three hundred twenty-one million, three hundred seventy thousand, six hundred thirteen".