16343581 has 2 divisors, whose sum is σ = 16343582. Its totient is φ = 16343580.

The previous prime is 16343573. The next prime is 16343623. The reversal of 16343581 is 18534361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9400356 + 6943225 = 3066^2 + 2635^2 .

It is an emirp because it is prime and its reverse (18534361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16343581 - 2³ = 16343573 is a prime.

It is a super-2 number, since 2×16343581² = 534225279807122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16343081) 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, 8171790 + 8171791.

It is an arithmetic number, because the mean of its divisors is an integer number (8171791).

Almost surely, 2^16343581 is an apocalyptic number.

It is an amenable number.

16343581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16343581 is an equidigital number, since it uses as much as digits as its factorization.

16343581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 16343581 is about 4042.7195054814. The cubic root of 16343581 is about 253.7751383768.

The spelling of 16343581 in words is "sixteen million, three hundred forty-three thousand, five hundred eighty-one".