19068991 has 2 divisors, whose sum is σ = 19068992. Its totient is φ = 19068990.

The previous prime is 19068983. The next prime is 19068997. The reversal of 19068991 is 19986091.

It is a strong prime.

It is an emirp because it is prime and its reverse (19986091) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 16689061 and 16098661.

It is a cyclic number.

It is not a de Polignac number, because 19068991 - 2³ = 19068983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19068997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9534495 + 9534496.

It is an arithmetic number, because the mean of its divisors is an integer number (9534496).

Almost surely, 2^19068991 is an apocalyptic number.

19068991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19068991 is an equidigital number, since it uses as much as digits as its factorization.

19068991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19068991 is about 4366.8055830321. The cubic root of 19068991 is about 267.1627496493.

The spelling of 19068991 in words is "nineteen million, sixty-eight thousand, nine hundred ninety-one".