172395561 has 16 divisors (see below), whose sum is σ = 247782080. Its totient is φ = 105986880.

The previous prime is 172395547. The next prime is 172395563. The reversal of 172395561 is 165593271.

It is not a de Polignac number, because 172395561 - 2¹⁴ = 172379177 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (172395563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66630 + ... + 69168.

It is an arithmetic number, because the mean of its divisors is an integer number (15486380).

Almost surely, 2^172395561 is an apocalyptic number.

It is an amenable number.

172395561 is a deficient number, since it is larger than the sum of its proper divisors (75386519).

172395561 is a wasteful number, since it uses less digits than its factorization.

172395561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296.

The product of its digits is 56700, while the sum is 39.

The square root of 172395561 is about 13129.9490098020. The cubic root of 172395561 is about 556.5557743818. Note that the first 3 decimals are identical.

The spelling of 172395561 in words is "one hundred seventy-two million, three hundred ninety-five thousand, five hundred sixty-one".