189819647 has 2 divisors, whose sum is σ = 189819648. Its totient is φ = 189819646.

The previous prime is 189819611. The next prime is 189819653. The reversal of 189819647 is 746918981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189819647 - 2¹⁶ = 189754111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189819677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94909823 + 94909824.

It is an arithmetic number, because the mean of its divisors is an integer number (94909824).

Almost surely, 2^189819647 is an apocalyptic number.

189819647 is a deficient number, since it is larger than the sum of its proper divisors (1).

189819647 is an equidigital number, since it uses as much as digits as its factorization.

189819647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 189819647 is about 13777.5051079649. The cubic root of 189819647 is about 574.7077501628.

The spelling of 189819647 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, six hundred forty-seven".