16391329 has 2 divisors, whose sum is σ = 16391330. Its totient is φ = 16391328.

The previous prime is 16391303. The next prime is 16391339. The reversal of 16391329 is 92319361.

16391329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8690704 + 7700625 = 2948^2 + 2775^2 .

It is an emirp because it is prime and its reverse (92319361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16391329 - 2¹³ = 16383137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16391294 and 16391303.

It is not a weakly prime, because it can be changed into another prime (16391339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195664 + 8195665.

It is an arithmetic number, because the mean of its divisors is an integer number (8195665).

Almost surely, 2^16391329 is an apocalyptic number.

It is an amenable number.

16391329 is a deficient number, since it is larger than the sum of its proper divisors (1).

16391329 is an equidigital number, since it uses as much as digits as its factorization.

16391329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 16391329 is about 4048.6206293008. The cubic root of 16391329 is about 254.0220339659.

The spelling of 16391329 in words is "sixteen million, three hundred ninety-one thousand, three hundred twenty-nine".