189492161 has 2 divisors, whose sum is σ = 189492162. Its totient is φ = 189492160.

The previous prime is 189492157. The next prime is 189492179. The reversal of 189492161 is 161294981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178890625 + 10601536 = 13375^2 + 3256^2 .

It is an emirp because it is prime and its reverse (161294981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189492161 - 2² = 189492157 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (189492131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94746080 + 94746081.

It is an arithmetic number, because the mean of its divisors is an integer number (94746081).

Almost surely, 2^189492161 is an apocalyptic number.

It is an amenable number.

189492161 is a deficient number, since it is larger than the sum of its proper divisors (1).

189492161 is an equidigital number, since it uses as much as digits as its factorization.

189492161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 189492161 is about 13765.6151696900. The cubic root of 189492161 is about 574.3770554135.

The spelling of 189492161 in words is "one hundred eighty-nine million, four hundred ninety-two thousand, one hundred sixty-one".