172272329 has 2 divisors, whose sum is σ = 172272330. Its totient is φ = 172272328.

The previous prime is 172272311. The next prime is 172272371. The reversal of 172272329 is 923272271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 44582329 = 11300^2 + 6677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172272329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172272029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86136164 + 86136165.

It is an arithmetic number, because the mean of its divisors is an integer number (86136165).

Almost surely, 2^172272329 is an apocalyptic number.

It is an amenable number.

172272329 is a deficient number, since it is larger than the sum of its proper divisors (1).

172272329 is an equidigital number, since it uses as much as digits as its factorization.

172272329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The square root of 172272329 is about 13125.2553879915. The cubic root of 172272329 is about 556.4231301509.

The spelling of 172272329 in words is "one hundred seventy-two million, two hundred seventy-two thousand, three hundred twenty-nine".