172661201 has 2 divisors, whose sum is σ = 172661202. Its totient is φ = 172661200.

The previous prime is 172661183. The next prime is 172661219. The reversal of 172661201 is 102166271.

It is a balanced prime because it is at equal distance from previous prime (172661183) and next prime (172661219).

It can be written as a sum of positive squares in only one way, i.e., 140398801 + 32262400 = 11849^2 + 5680^2 .

It is an emirp because it is prime and its reverse (102166271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172661201 is a prime.

It is not a weakly prime, because it can be changed into another prime (172661501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86330600 + 86330601.

It is an arithmetic number, because the mean of its divisors is an integer number (86330601).

Almost surely, 2^172661201 is an apocalyptic number.

It is an amenable number.

172661201 is a deficient number, since it is larger than the sum of its proper divisors (1).

172661201 is an equidigital number, since it uses as much as digits as its factorization.

172661201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 172661201 is about 13140.0609207111. The cubic root of 172661201 is about 556.8414886308.

The spelling of 172661201 in words is "one hundred seventy-two million, six hundred sixty-one thousand, two hundred one".