189111971 has 2 divisors, whose sum is σ = 189111972. Its totient is φ = 189111970.

The previous prime is 189111943. The next prime is 189112013. The reversal of 189111971 is 179111981.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (179111981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189111971 - 2²⁶ = 122003107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189113971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94555985 + 94555986.

It is an arithmetic number, because the mean of its divisors is an integer number (94555986).

Almost surely, 2^189111971 is an apocalyptic number.

189111971 is a deficient number, since it is larger than the sum of its proper divisors (1).

189111971 is an equidigital number, since it uses as much as digits as its factorization.

189111971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 38.

The square root of 189111971 is about 13751.7988277898. The cubic root of 189111971 is about 573.9926619918.

The spelling of 189111971 in words is "one hundred eighty-nine million, one hundred eleven thousand, nine hundred seventy-one".