189317647 has 2 divisors, whose sum is σ = 189317648. Its totient is φ = 189317646.

The previous prime is 189317633. The next prime is 189317659. The reversal of 189317647 is 746713981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189317647 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 189317597 and 189317606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189317677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94658823 + 94658824.

It is an arithmetic number, because the mean of its divisors is an integer number (94658824).

Almost surely, 2^189317647 is an apocalyptic number.

189317647 is a deficient number, since it is larger than the sum of its proper divisors (1).

189317647 is an equidigital number, since it uses as much as digits as its factorization.

189317647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 189317647 is about 13759.2749445601. The cubic root of 189317647 is about 574.2006758667.

The spelling of 189317647 in words is "one hundred eighty-nine million, three hundred seventeen thousand, six hundred forty-seven".