981187 has 2 divisors, whose sum is σ = 981188. Its totient is φ = 981186.

The previous prime is 981173. The next prime is 981199. The reversal of 981187 is 781189.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 981187 - 2¹⁹ = 456899 is a prime.

It is not a weakly prime, because it can be changed into another prime (981137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490593 + 490594.

It is an arithmetic number, because the mean of its divisors is an integer number (490594).

2⁹⁸¹¹⁸⁷ is an apocalyptic number.

981187 is a deficient number, since it is larger than the sum of its proper divisors (1).

981187 is an equidigital number, since it uses as much as digits as its factorization.

981187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 34.

The square root of 981187 is about 990.5488377662. The cubic root of 981187 is about 99.3689258315.

The spelling of 981187 in words is "nine hundred eighty-one thousand, one hundred eighty-seven".