7180321 has 2 divisors, whose sum is σ = 7180322. Its totient is φ = 7180320.

The previous prime is 7180319. The next prime is 7180333. The reversal of 7180321 is 1230817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 829921 = 2520^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 7180321 - 2¹ = 7180319 is a prime.

Together with 7180319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 7180292 and 7180301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7180351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3590160 + 3590161.

It is an arithmetic number, because the mean of its divisors is an integer number (3590161).

Almost surely, 2^7180321 is an apocalyptic number.

It is an amenable number.

7180321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7180321 is an equidigital number, since it uses as much as digits as its factorization.

7180321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 7180321 is about 2679.6120987934. The cubic root of 7180321 is about 192.9217917170.

It can be divided in two parts, 71803 and 21, that added together give a square (71824 = 268²).

The spelling of 7180321 in words is "seven million, one hundred eighty thousand, three hundred twenty-one".