172145071 has 16 divisors (see below), whose sum is σ = 200761344. Its totient is φ = 144565344.

The previous prime is 172145069. The next prime is 172145081. The reversal of 172145071 is 170541271.

It is not a de Polignac number, because 172145071 - 2¹ = 172145069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172145081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72621 + ... + 74953.

It is an arithmetic number, because the mean of its divisors is an integer number (12547584).

Almost surely, 2^172145071 is an apocalyptic number.

172145071 is a deficient number, since it is larger than the sum of its proper divisors (28616273).

172145071 is a wasteful number, since it uses less digits than its factorization.

172145071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 172145071 is about 13120.4066629049. The cubic root of 172145071 is about 556.2860860148.

The spelling of 172145071 in words is "one hundred seventy-two million, one hundred forty-five thousand, seventy-one".