172805353 has 4 divisors (see below), whose sum is σ = 197491840. Its totient is φ = 148118868.

The previous prime is 172805333. The next prime is 172805383. The reversal of 172805353 is 353508271.

172805353 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172805353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172805333) 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, 12343233 + ... + 12343246.

It is an arithmetic number, because the mean of its divisors is an integer number (49372960).

Almost surely, 2^172805353 is an apocalyptic number.

It is an amenable number.

172805353 is a deficient number, since it is larger than the sum of its proper divisors (24686487).

172805353 is an equidigital number, since it uses as much as digits as its factorization.

172805353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24686486.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 172805353 is about 13145.5449868007. The cubic root of 172805353 is about 556.9964114614.

The spelling of 172805353 in words is "one hundred seventy-two million, eight hundred five thousand, three hundred fifty-three".