19191047 has 2 divisors, whose sum is σ = 19191048. Its totient is φ = 19191046.

The previous prime is 19191037. The next prime is 19191059. The reversal of 19191047 is 74019191.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (74019191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19191047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19191037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9595523 + 9595524.

It is an arithmetic number, because the mean of its divisors is an integer number (9595524).

Almost surely, 2^19191047 is an apocalyptic number.

19191047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19191047 is an equidigital number, since it uses as much as digits as its factorization.

19191047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 19191047 is about 4380.7587242394. The cubic root of 19191047 is about 267.7315524980.

The spelling of 19191047 in words is "nineteen million, one hundred ninety-one thousand, forty-seven".