170809453 has 4 divisors (see below), whose sum is σ = 171175680. Its totient is φ = 170443228.

The previous prime is 170809451. The next prime is 170809481. The reversal of 170809453 is 354908071.

170809453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 354908071 = 7 ⋅50701153.

It is a cyclic number.

It is not a de Polignac number, because 170809453 - 2¹ = 170809451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170809451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182413 + ... + 183346.

It is an arithmetic number, because the mean of its divisors is an integer number (42793920).

Almost surely, 2^170809453 is an apocalyptic number.

It is an amenable number.

170809453 is a deficient number, since it is larger than the sum of its proper divisors (366227).

170809453 is an equidigital number, since it uses as much as digits as its factorization.

170809453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366226.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 170809453 is about 13069.4090532051. The cubic root of 170809453 is about 554.8436677885.

The spelling of 170809453 in words is "one hundred seventy million, eight hundred nine thousand, four hundred fifty-three".