169987 has 2 divisors, whose sum is σ = 169988. Its totient is φ = 169986.

The previous prime is 169957. The next prime is 169991. The reversal of 169987 is 789961.

It is a strong prime.

It is an emirp because it is prime and its reverse (789961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 169987 - 2⁷ = 169859 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (169937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84993 + 84994.

It is an arithmetic number, because the mean of its divisors is an integer number (84994).

2¹⁶⁹⁹⁸⁷ is an apocalyptic number.

169987 is a deficient number, since it is larger than the sum of its proper divisors (1).

169987 is an equidigital number, since it uses as much as digits as its factorization.

169987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 169987 is about 412.2947974447. The cubic root of 169987 is about 55.3951704618.

It can be divided in two parts, 169 and 987, that added together give a square (1156 = 34²).

The spelling of 169987 in words is "one hundred sixty-nine thousand, nine hundred eighty-seven".