19316819 has 2 divisors, whose sum is σ = 19316820. Its totient is φ = 19316818.

The previous prime is 19316779. The next prime is 19316821. The reversal of 19316819 is 91861391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19316819 - 2¹⁶ = 19251283 is a prime.

It is a super-2 number, since 2×19316819² = 746278992557522, which contains 22 as substring.

Together with 19316821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19316119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9658409 + 9658410.

It is an arithmetic number, because the mean of its divisors is an integer number (9658410).

Almost surely, 2^19316819 is an apocalyptic number.

19316819 is a deficient number, since it is larger than the sum of its proper divisors (1).

19316819 is an equidigital number, since it uses as much as digits as its factorization.

19316819 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 19316819 is about 4395.0903289921. The cubic root of 19316819 is about 268.3151551626.

The spelling of 19316819 in words is "nineteen million, three hundred sixteen thousand, eight hundred nineteen".