163987 has 2 divisors, whose sum is σ = 163988. Its totient is φ = 163986.

The previous prime is 163981. The next prime is 163991. The reversal of 163987 is 789361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163987 - 2³ = 163979 is a prime.

It is not a weakly prime, because it can be changed into another prime (163981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81993 + 81994.

It is an arithmetic number, because the mean of its divisors is an integer number (81994).

2¹⁶³⁹⁸⁷ is an apocalyptic number.

163987 is a deficient number, since it is larger than the sum of its proper divisors (1).

163987 is an equidigital number, since it uses as much as digits as its factorization.

163987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 163987 is about 404.9530837023. The cubic root of 163987 is about 54.7355904060.

The spelling of 163987 in words is "one hundred sixty-three thousand, nine hundred eighty-seven".