19216819 has 2 divisors, whose sum is σ = 19216820. Its totient is φ = 19216818.

The previous prime is 19216781. The next prime is 19216849. The reversal of 19216819 is 91861291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19216819 - 2¹¹ = 19214771 is a prime.

It is a super-2 number, since 2×19216819² = 738572264957522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19216849) 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, 9608409 + 9608410.

It is an arithmetic number, because the mean of its divisors is an integer number (9608410).

Almost surely, 2^19216819 is an apocalyptic number.

19216819 is a deficient number, since it is larger than the sum of its proper divisors (1).

19216819 is an equidigital number, since it uses as much as digits as its factorization.

19216819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 37.

The square root of 19216819 is about 4383.6992369459. The cubic root of 19216819 is about 267.8513460519.

The spelling of 19216819 in words is "nineteen million, two hundred sixteen thousand, eight hundred nineteen".