187884161 has 2 divisors, whose sum is σ = 187884162. Its totient is φ = 187884160.

The previous prime is 187884133. The next prime is 187884163. The reversal of 187884161 is 161488781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97634161 + 90250000 = 9881^2 + 9500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187884161 is a prime.

Together with 187884163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187884163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93942080 + 93942081.

It is an arithmetic number, because the mean of its divisors is an integer number (93942081).

Almost surely, 2^187884161 is an apocalyptic number.

It is an amenable number.

187884161 is a deficient number, since it is larger than the sum of its proper divisors (1).

187884161 is an equidigital number, since it uses as much as digits as its factorization.

187884161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 44.

The square root of 187884161 is about 13707.0843362110. The cubic root of 187884161 is about 572.7477475681.

The spelling of 187884161 in words is "one hundred eighty-seven million, eight hundred eighty-four thousand, one hundred sixty-one".