172423161 has 15 divisors (see below), whose sum is σ = 257747061. Its totient is φ = 114869988.

The previous prime is 172423159. The next prime is 172423177. The reversal of 172423161 is 161324271.

The square root of 172423161 is 13131.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 172423161 - 2¹ = 172423159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172423561) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 117450 + ... + 118908.

Almost surely, 2^172423161 is an apocalyptic number.

172423161 is the 13131-st square number.

172423161 is the 6566-th centered octagonal number.

It is an amenable number.

172423161 is a deficient number, since it is larger than the sum of its proper divisors (85323900).

172423161 is an frugal number, since it uses more digits than its factorization.

172423161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930 (or 1462 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The cubic root of 172423161 is about 556.5854737538.

The spelling of 172423161 in words is "one hundred seventy-two million, four hundred twenty-three thousand, one hundred sixty-one".