172215841 has 8 divisors (see below), whose sum is σ = 200835200. Its totient is φ = 147613284.

The previous prime is 172215803. The next prime is 172215847. The reversal of 172215841 is 148512271.

It is not a de Polignac number, because 172215841 - 2¹¹ = 172213793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172215847) 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, 250701 + ... + 251386.

It is an arithmetic number, because the mean of its divisors is an integer number (25104400).

Almost surely, 2^172215841 is an apocalyptic number.

It is an amenable number.

172215841 is a deficient number, since it is larger than the sum of its proper divisors (28619359).

172215841 is an frugal number, since it uses more digits than its factorization.

172215841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502108 (or 502094 counting only the distinct ones).

The product of its digits is 4480, while the sum is 31.

The square root of 172215841 is about 13123.1033296244. The cubic root of 172215841 is about 556.3623065584.

It can be divided in two parts, 172215 and 841, that added together give a square (173056 = 416²).

The spelling of 172215841 in words is "one hundred seventy-two million, two hundred fifteen thousand, eight hundred forty-one".