172727221 has 8 divisors (see below), whose sum is σ = 175440384. Its totient is φ = 170033280.

The previous prime is 172727131. The next prime is 172727237. The reversal of 172727221 is 122727271.

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

It is a cyclic number.

It is not a de Polignac number, because 172727221 - 2¹¹ = 172725173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172727921) 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, 13866 + ... + 23188.

It is an arithmetic number, because the mean of its divisors is an integer number (21930048).

Almost surely, 2^172727221 is an apocalyptic number.

It is an amenable number.

172727221 is a deficient number, since it is larger than the sum of its proper divisors (2713163).

172727221 is an equidigital number, since it uses as much as digits as its factorization.

172727221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611.

The product of its digits is 5488, while the sum is 31.

The square root of 172727221 is about 13142.5728455276. The cubic root of 172727221 is about 556.9124522487.

The spelling of 172727221 in words is "one hundred seventy-two million, seven hundred twenty-seven thousand, two hundred twenty-one".