172226161 has 2 divisors, whose sum is σ = 172226162. Its totient is φ = 172226160.

The previous prime is 172226149. The next prime is 172226177. The reversal of 172226161 is 161622271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 27625536 = 12025^2 + 5256^2 .

It is an emirp because it is prime and its reverse (161622271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172226161 - 2¹⁵ = 172193393 is a prime.

It is not a weakly prime, because it can be changed into another prime (172226101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86113080 + 86113081.

It is an arithmetic number, because the mean of its divisors is an integer number (86113081).

Almost surely, 2^172226161 is an apocalyptic number.

It is an amenable number.

172226161 is a deficient number, since it is larger than the sum of its proper divisors (1).

172226161 is an equidigital number, since it uses as much as digits as its factorization.

172226161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 172226161 is about 13123.4965234117. The cubic root of 172226161 is about 556.3734196366.

The spelling of 172226161 in words is "one hundred seventy-two million, two hundred twenty-six thousand, one hundred sixty-one".