16391819 has 2 divisors, whose sum is σ = 16391820. Its totient is φ = 16391818.

The previous prime is 16391803. The next prime is 16391833. The reversal of 16391819 is 91819361.

It is a strong prime.

It is an emirp because it is prime and its reverse (91819361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16391819 - 2⁴ = 16391803 is a prime.

It is a super-2 number, since 2×16391819² = 537383460257522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16390819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195909 + 8195910.

It is an arithmetic number, because the mean of its divisors is an integer number (8195910).

Almost surely, 2^16391819 is an apocalyptic number.

16391819 is a deficient number, since it is larger than the sum of its proper divisors (1).

16391819 is an equidigital number, since it uses as much as digits as its factorization.

16391819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 38.

The square root of 16391819 is about 4048.6811432860. The cubic root of 16391819 is about 254.0245651733.

The spelling of 16391819 in words is "sixteen million, three hundred ninety-one thousand, eight hundred nineteen".