172856933 has 4 divisors (see below), whose sum is σ = 177528780. Its totient is φ = 168185088.

The previous prime is 172856921. The next prime is 172856939. The reversal of 172856933 is 339658271.

172856933 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.

It can be written as a sum of positive squares in 2 ways, for example, as 114211969 + 58644964 = 10687^2 + 7658^2 .

It is a cyclic number.

It is not a de Polignac number, because 172856933 - 2⁴ = 172856917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172856939) 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, 2335868 + ... + 2335941.

It is an arithmetic number, because the mean of its divisors is an integer number (44382195).

Almost surely, 2^172856933 is an apocalyptic number.

It is an amenable number.

172856933 is a deficient number, since it is larger than the sum of its proper divisors (4671847).

172856933 is an equidigital number, since it uses as much as digits as its factorization.

172856933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671846.

The product of its digits is 272160, while the sum is 44.

The square root of 172856933 is about 13147.5067218085. The cubic root of 172856933 is about 557.0518245151.

The spelling of 172856933 in words is "one hundred seventy-two million, eight hundred fifty-six thousand, nine hundred thirty-three".