19509419 has 2 divisors, whose sum is σ = 19509420. Its totient is φ = 19509418.

The previous prime is 19509407. The next prime is 19509433. The reversal of 19509419 is 91490591.

It is a weak prime.

It is an emirp because it is prime and its reverse (91490591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19509419 - 2⁸ = 19509163 is a prime.

It is a super-2 number, since 2×19509419² = 761234859435122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19509439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9754709 + 9754710.

It is an arithmetic number, because the mean of its divisors is an integer number (9754710).

Almost surely, 2^19509419 is an apocalyptic number.

19509419 is a deficient number, since it is larger than the sum of its proper divisors (1).

19509419 is an equidigital number, since it uses as much as digits as its factorization.

19509419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 19509419 is about 4416.9467961478. The cubic root of 19509419 is about 269.2039607906.

Subtracting from 19509419 its sum of digits (38), we obtain a triangular number (19509381 = T₆₂₄₆).

The spelling of 19509419 in words is "nineteen million, five hundred nine thousand, four hundred nineteen".