6611321 has 2 divisors, whose sum is σ = 6611322. Its totient is φ = 6611320.

The previous prime is 6611303. The next prime is 6611323. The reversal of 6611321 is 1231166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5953600 + 657721 = 2440^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 6611321 - 2²² = 2417017 is a prime.

Together with 6611323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6611293 and 6611302.

It is not a weakly prime, because it can be changed into another prime (6611323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305660 + 3305661.

It is an arithmetic number, because the mean of its divisors is an integer number (3305661).

Almost surely, 2^6611321 is an apocalyptic number.

It is an amenable number.

6611321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611321 is an equidigital number, since it uses as much as digits as its factorization.

6611321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 6611321 is about 2571.2489183274. The cubic root of 6611321 is about 187.6849351642.

Adding to 6611321 its reverse (1231166), we get a palindrome (7842487).

It can be divided in two parts, 661 and 1321, that multiplied together give a triangular number (873181 = T₁₃₂₁).

The spelling of 6611321 in words is "six million, six hundred eleven thousand, three hundred twenty-one".