999189047 has 2 divisors, whose sum is σ = 999189048. Its totient is φ = 999189046.

The previous prime is 999188987. The next prime is 999189049. The reversal of 999189047 is 740981999.

It is a strong prime.

It is an emirp because it is prime and its reverse (740981999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999189047 - 2¹⁰ = 999188023 is a prime.

Together with 999189049, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999188983 and 999189001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999189049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499594523 + 499594524.

It is an arithmetic number, because the mean of its divisors is an integer number (499594524).

Almost surely, 2^999189047 is an apocalyptic number.

999189047 is a deficient number, since it is larger than the sum of its proper divisors (1).

999189047 is an equidigital number, since it uses as much as digits as its factorization.

999189047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 999189047 is about 31609.9517082833. The cubic root of 999189047 is about 999.7296092288.

The spelling of 999189047 in words is "nine hundred ninety-nine million, one hundred eighty-nine thousand, forty-seven".