170512987 has 2 divisors, whose sum is σ = 170512988. Its totient is φ = 170512986.

The previous prime is 170512981. The next prime is 170512997. The reversal of 170512987 is 789215071.

170512987 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 is an emirp because it is prime and its reverse (789215071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170512987 is a prime.

It is not a weakly prime, because it can be changed into another prime (170512981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85256493 + 85256494.

It is an arithmetic number, because the mean of its divisors is an integer number (85256494).

Almost surely, 2^170512987 is an apocalyptic number.

170512987 is a deficient number, since it is larger than the sum of its proper divisors (1).

170512987 is an equidigital number, since it uses as much as digits as its factorization.

170512987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 170512987 is about 13058.0621456631. The cubic root of 170512987 is about 554.5224764668.

The spelling of 170512987 in words is "one hundred seventy million, five hundred twelve thousand, nine hundred eighty-seven".