13321993 has 2 divisors, whose sum is σ = 13321994. Its totient is φ = 13321992.

The previous prime is 13321981. The next prime is 13322003. The reversal of 13321993 is 39912331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 1951609 = 3372^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321993 - 2⁹ = 13321481 is a prime.

It is not a weakly prime, because it can be changed into another prime (13321493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660996 + 6660997.

It is an arithmetic number, because the mean of its divisors is an integer number (6660997).

Almost surely, 2^13321993 is an apocalyptic number.

It is an amenable number.

13321993 is a deficient number, since it is larger than the sum of its proper divisors (1).

13321993 is an equidigital number, since it uses as much as digits as its factorization.

13321993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 13321993 is about 3649.9305472844. The cubic root of 13321993 is about 237.0589739713.

The spelling of 13321993 in words is "thirteen million, three hundred twenty-one thousand, nine hundred ninety-three".