170491649 has 4 divisors (see below), whose sum is σ = 170542164. Its totient is φ = 170441136.

The previous prime is 170491639. The next prime is 170491679. The reversal of 170491649 is 946194071.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4906225 + 165585424 = 2215^2 + 12868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170491649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (170491639) 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 3 ways as a sum of consecutive naturals, for example, 19802 + ... + 27075.

It is an arithmetic number, because the mean of its divisors is an integer number (42635541).

Almost surely, 2^170491649 is an apocalyptic number.

It is an amenable number.

170491649 is a deficient number, since it is larger than the sum of its proper divisors (50515).

170491649 is an equidigital number, since it uses as much as digits as its factorization.

170491649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50514.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 170491649 is about 13057.2450769678. The cubic root of 170491649 is about 554.4993445158.

The spelling of 170491649 in words is "one hundred seventy million, four hundred ninety-one thousand, six hundred forty-nine".