16318261 has 2 divisors, whose sum is σ = 16318262. Its totient is φ = 16318260.

The previous prime is 16318229. The next prime is 16318273. The reversal of 16318261 is 16281361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 398161 = 3990^2 + 631^2 .

It is an emirp because it is prime and its reverse (16281361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16318261 - 2⁵ = 16318229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16388261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8159130 + 8159131.

It is an arithmetic number, because the mean of its divisors is an integer number (8159131).

Almost surely, 2^16318261 is an apocalyptic number.

It is an amenable number.

16318261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16318261 is an equidigital number, since it uses as much as digits as its factorization.

16318261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 16318261 is about 4039.5867362888. The cubic root of 16318261 is about 253.6440184465.

The spelling of 16318261 in words is "sixteen million, three hundred eighteen thousand, two hundred sixty-one".