189191172047 has 2 divisors, whose sum is σ = 189191172048. Its totient is φ = 189191172046.

The previous prime is 189191172029. The next prime is 189191172097. The reversal of 189191172047 is 740271191981.

It is an a-pointer prime, because the next prime (189191172097) can be obtained adding 189191172047 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189191172047 - 2⁸ = 189191171791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189191171986 and 189191172004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189191172097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94595586023 + 94595586024.

It is an arithmetic number, because the mean of its divisors is an integer number (94595586024).

Almost surely, 2^189191172047 is an apocalyptic number.

189191172047 is a deficient number, since it is larger than the sum of its proper divisors (1).

189191172047 is an equidigital number, since it uses as much as digits as its factorization.

189191172047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 50.

The spelling of 189191172047 in words is "one hundred eighty-nine billion, one hundred ninety-one million, one hundred seventy-two thousand, forty-seven".