172725229 has 2 divisors, whose sum is σ = 172725230. Its totient is φ = 172725228.

The previous prime is 172725187. The next prime is 172725269. The reversal of 172725229 is 922527271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172396900 + 328329 = 13130^2 + 573^2 .

It is an emirp because it is prime and its reverse (922527271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172725229 - 2¹¹ = 172723181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172725269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86362614 + 86362615.

It is an arithmetic number, because the mean of its divisors is an integer number (86362615).

Almost surely, 2^172725229 is an apocalyptic number.

It is an amenable number.

172725229 is a deficient number, since it is larger than the sum of its proper divisors (1).

172725229 is an equidigital number, since it uses as much as digits as its factorization.

172725229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 172725229 is about 13142.4970610611. The cubic root of 172725229 is about 556.9103113511.

The spelling of 172725229 in words is "one hundred seventy-two million, seven hundred twenty-five thousand, two hundred twenty-nine".