187742089 has 2 divisors, whose sum is σ = 187742090. Its totient is φ = 187742088.

The previous prime is 187742063. The next prime is 187742129. The reversal of 187742089 is 980247781.

187742089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131492089 + 56250000 = 11467^2 + 7500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187742089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (187742039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93871044 + 93871045.

It is an arithmetic number, because the mean of its divisors is an integer number (93871045).

Almost surely, 2^187742089 is an apocalyptic number.

It is an amenable number.

187742089 is a deficient number, since it is larger than the sum of its proper divisors (1).

187742089 is an equidigital number, since it uses as much as digits as its factorization.

187742089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 187742089 is about 13701.9009265138. The cubic root of 187742089 is about 572.6033466487.

The spelling of 187742089 in words is "one hundred eighty-seven million, seven hundred forty-two thousand, eighty-nine".