171000989 has 2 divisors, whose sum is σ = 171000990. Its totient is φ = 171000988.

The previous prime is 171000983. The next prime is 171001031. The reversal of 171000989 is 989000171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91202500 + 79798489 = 9550^2 + 8933^2 .

It is an emirp because it is prime and its reverse (989000171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171000989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171000983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85500494 + 85500495.

It is an arithmetic number, because the mean of its divisors is an integer number (85500495).

Almost surely, 2^171000989 is an apocalyptic number.

It is an amenable number.

171000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

171000989 is an equidigital number, since it uses as much as digits as its factorization.

171000989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 171000989 is about 13076.7346459275. The cubic root of 171000989 is about 555.0509803561.

The spelling of 171000989 in words is "one hundred seventy-one million, nine hundred eighty-nine", and thus it is an aban number.