172255709 has 4 divisors (see below), whose sum is σ = 173207580. Its totient is φ = 171303840.

The previous prime is 172255697. The next prime is 172255753. The reversal of 172255709 is 907552271.

172255709 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 an emirpimes, since its reverse is a distinct semiprime: 907552271 = 19 ⋅47765909.

It can be written as a sum of positive squares in 2 ways, for example, as 28783225 + 143472484 = 5365^2 + 11978^2 .

It is a cyclic number.

It is not a de Polignac number, because 172255709 - 2⁴ = 172255693 is a prime.

It is a super-3 number, since 3×172255709³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172255789) 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, 475664 + ... + 476025.

It is an arithmetic number, because the mean of its divisors is an integer number (43301895).

Almost surely, 2^172255709 is an apocalyptic number.

It is an amenable number.

172255709 is a deficient number, since it is larger than the sum of its proper divisors (951871).

172255709 is an equidigital number, since it uses as much as digits as its factorization.

172255709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951870.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 172255709 is about 13124.6222421828. The cubic root of 172255709 is about 556.4052359058.

The spelling of 172255709 in words is "one hundred seventy-two million, two hundred fifty-five thousand, seven hundred nine".