1613321 has 2 divisors, whose sum is σ = 1613322. Its totient is φ = 1613320.

The previous prime is 1613279. The next prime is 1613323. The reversal of 1613321 is 1233161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597696 + 15625 = 1264^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1613321 is a prime.

Together with 1613323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1613321.

It is not a weakly prime, because it can be changed into another prime (1613323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806660 + 806661.

It is an arithmetic number, because the mean of its divisors is an integer number (806661).

2^1613321 is an apocalyptic number.

It is an amenable number.

1613321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613321 is an equidigital number, since it uses as much as digits as its factorization.

1613321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1613321 is about 1270.1657372170. The cubic root of 1613321 is about 117.2844032020.

Adding to 1613321 its reverse (1233161), we get a palindrome (2846482).

The spelling of 1613321 in words is "one million, six hundred thirteen thousand, three hundred twenty-one".