19085999 has 2 divisors, whose sum is σ = 19086000. Its totient is φ = 19085998.

The previous prime is 19085981. The next prime is 19086029. The reversal of 19085999 is 99958091.

It is a weak prime.

It is an emirp because it is prime and its reverse (99958091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19085999 - 2⁸ = 19085743 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19085909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9542999 + 9543000.

It is an arithmetic number, because the mean of its divisors is an integer number (9543000).

Almost surely, 2^19085999 is an apocalyptic number.

19085999 is a deficient number, since it is larger than the sum of its proper divisors (1).

19085999 is an equidigital number, since it uses as much as digits as its factorization.

19085999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 19085999 is about 4368.7525679535. The cubic root of 19085999 is about 267.2421552452.

The spelling of 19085999 in words is "nineteen million, eighty-five thousand, nine hundred ninety-nine".