172009545 has 16 divisors (see below), whose sum is σ = 284093952. Its totient is φ = 88778880.

The previous prime is 172009543. The next prime is 172009561. The reversal of 172009545 is 545900271.

It is not a de Polignac number, because 172009545 - 2¹ = 172009543 is a prime.

It is a super-2 number, since 2×172009545² = 59174567142214050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172009543) 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, 184492 + ... + 185421.

It is an arithmetic number, because the mean of its divisors is an integer number (17755872).

Almost surely, 2^172009545 is an apocalyptic number.

172009545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172009545 is a deficient number, since it is larger than the sum of its proper divisors (112084407).

172009545 is a wasteful number, since it uses less digits than its factorization.

172009545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369952.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 172009545 is about 13115.2409432690. The cubic root of 172009545 is about 556.1400637849.

The spelling of 172009545 in words is "one hundred seventy-two million, nine thousand, five hundred forty-five".