16551361 has 2 divisors, whose sum is σ = 16551362. Its totient is φ = 16551360.

The previous prime is 16551343. The next prime is 16551377. The reversal of 16551361 is 16315561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9363600 + 7187761 = 3060^2 + 2681^2 .

It is an emirp because it is prime and its reverse (16315561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16551361 - 2⁷ = 16551233 is a prime.

It is not a weakly prime, because it can be changed into another prime (16551341) 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, 8275680 + 8275681.

It is an arithmetic number, because the mean of its divisors is an integer number (8275681).

Almost surely, 2^16551361 is an apocalyptic number.

It is an amenable number.

16551361 is a deficient number, since it is larger than the sum of its proper divisors (1).

16551361 is an equidigital number, since it uses as much as digits as its factorization.

16551361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 28.

The square root of 16551361 is about 4068.3363921878. The cubic root of 16551361 is about 254.8460483008.

The spelling of 16551361 in words is "sixteen million, five hundred fifty-one thousand, three hundred sixty-one".