172445161 has 12 divisors (see below), whose sum is σ = 212400468. Its totient is φ = 139114752.

The previous prime is 172445153. The next prime is 172445173. The reversal of 172445161 is 161544271.

It can be written as a sum of positive squares in 2 ways, for example, as 85377600 + 87067561 = 9240^2 + 9331^2 .

It is not a de Polignac number, because 172445161 - 2³ = 172445153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172445111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102676 + ... + 104341.

It is an arithmetic number, because the mean of its divisors is an integer number (17700039).

Almost surely, 2^172445161 is an apocalyptic number.

It is an amenable number.

172445161 is a deficient number, since it is larger than the sum of its proper divisors (39955307).

172445161 is a wasteful number, since it uses less digits than its factorization.

172445161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207048 (or 207041 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 172445161 is about 13131.8376855640. The cubic root of 172445161 is about 556.6091448964.

The spelling of 172445161 in words is "one hundred seventy-two million, four hundred forty-five thousand, one hundred sixty-one".