9181321 has 2 divisors, whose sum is σ = 9181322. Its totient is φ = 9181320.

The previous prime is 9181303. The next prime is 9181327. The reversal of 9181321 is 1231819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 2524921 = 2580^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 9181321 - 2¹⁵ = 9148553 is a prime.

It is not a weakly prime, because it can be changed into another prime (9181327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4590660 + 4590661.

It is an arithmetic number, because the mean of its divisors is an integer number (4590661).

Almost surely, 2^9181321 is an apocalyptic number.

It is an amenable number.

9181321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9181321 is an equidigital number, since it uses as much as digits as its factorization.

9181321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 25.

The square root of 9181321 is about 3030.0694711508. The cubic root of 9181321 is about 209.3960044570.

The spelling of 9181321 in words is "nine million, one hundred eighty-one thousand, three hundred twenty-one".