172772155 has 8 divisors (see below), whose sum is σ = 212383584. Its totient is φ = 134846400.

The previous prime is 172772153. The next prime is 172772161. The reversal of 172772155 is 551277271.

172772155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172772155 - 2¹ = 172772153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172772153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421191 + ... + 421600.

It is an arithmetic number, because the mean of its divisors is an integer number (26547948).

Almost surely, 2^172772155 is an apocalyptic number.

172772155 is a deficient number, since it is larger than the sum of its proper divisors (39611429).

172772155 is an equidigital number, since it uses as much as digits as its factorization.

172772155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842837.

The product of its digits is 34300, while the sum is 37.

The square root of 172772155 is about 13144.2822169946. The cubic root of 172772155 is about 556.9607405928.

The spelling of 172772155 in words is "one hundred seventy-two million, seven hundred seventy-two thousand, one hundred fifty-five".