16555393 has 2 divisors, whose sum is σ = 16555394. Its totient is φ = 16555392.

The previous prime is 16555381. The next prime is 16555397. The reversal of 16555393 is 39355561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15904144 + 651249 = 3988^2 + 807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16555393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16555397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277696 + 8277697.

It is an arithmetic number, because the mean of its divisors is an integer number (8277697).

Almost surely, 2^16555393 is an apocalyptic number.

It is an amenable number.

16555393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555393 is an equidigital number, since it uses as much as digits as its factorization.

16555393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60750, while the sum is 37.

The square root of 16555393 is about 4068.8318962572. The cubic root of 16555393 is about 254.8667405738.

The spelling of 16555393 in words is "sixteen million, five hundred fifty-five thousand, three hundred ninety-three".