19739519 has 2 divisors, whose sum is σ = 19739520. Its totient is φ = 19739518.

The previous prime is 19739507. The next prime is 19739521. The reversal of 19739519 is 91593791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19739519 is a prime.

It is a super-2 number, since 2×19739519² = 779297220702722, which contains 22 as substring.

Together with 19739521, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19739519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19739549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9869759 + 9869760.

It is an arithmetic number, because the mean of its divisors is an integer number (9869760).

Almost surely, 2^19739519 is an apocalyptic number.

19739519 is a deficient number, since it is larger than the sum of its proper divisors (1).

19739519 is an equidigital number, since it uses as much as digits as its factorization.

19739519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 44.

The square root of 19739519 is about 4442.9178475412. The cubic root of 19739519 is about 270.2581846764.

The spelling of 19739519 in words is "nineteen million, seven hundred thirty-nine thousand, five hundred nineteen".