171145986 has 16 divisors (see below), whose sum is σ = 373409568. Its totient is φ = 51862400.

The previous prime is 171145981. The next prime is 171145991. The reversal of 171145986 is 689541171.

It is an interprime number because it is at equal distance from previous prime (171145981) and next prime (171145991).

It is not an unprimeable number, because it can be changed into a prime (171145981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296495 + ... + 1296626.

It is an arithmetic number, because the mean of its divisors is an integer number (23338098).

Almost surely, 2^171145986 is an apocalyptic number.

171145986 is an abundant number, since it is smaller than the sum of its proper divisors (202263582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171145986 is a wasteful number, since it uses less digits than its factorization.

171145986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593137.

The product of its digits is 60480, while the sum is 42.

The square root of 171145986 is about 13082.2775540041. The cubic root of 171145986 is about 555.2078176368.

The spelling of 171145986 in words is "one hundred seventy-one million, one hundred forty-five thousand, nine hundred eighty-six".