187142161 has 4 divisors (see below), whose sum is σ = 187426800. Its totient is φ = 186857524.

The previous prime is 187142147. The next prime is 187142177. The reversal of 187142161 is 161241781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 161241781 = 71 ⋅2271011.

It is a cyclic number.

It is not a de Polignac number, because 187142161 - 2⁵ = 187142129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187142101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141331 + ... + 142648.

It is an arithmetic number, because the mean of its divisors is an integer number (46856700).

Almost surely, 2^187142161 is an apocalyptic number.

It is an amenable number.

187142161 is a deficient number, since it is larger than the sum of its proper divisors (284639).

187142161 is an equidigital number, since it uses as much as digits as its factorization.

187142161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284638.

The product of its digits is 2688, while the sum is 31.

The square root of 187142161 is about 13679.9912646171. The cubic root of 187142161 is about 571.9927797106.

The spelling of 187142161 in words is "one hundred eighty-seven million, one hundred forty-two thousand, one hundred sixty-one".