172081718 has 16 divisors (see below), whose sum is σ = 273566160. Its totient is φ = 80902656.

The previous prime is 172081717. The next prime is 172081729. The reversal of 172081718 is 817180271.

It is a super-2 number, since 2×172081718² = 59224235339663048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172081717) 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 7 ways as a sum of consecutive naturals, for example, 51173 + ... + 54431.

It is an arithmetic number, because the mean of its divisors is an integer number (17097885).

Almost surely, 2^172081718 is an apocalyptic number.

172081718 is a deficient number, since it is larger than the sum of its proper divisors (101484442).

172081718 is a wasteful number, since it uses less digits than its factorization.

172081718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 172081718 is about 13117.9921481910. The cubic root of 172081718 is about 556.2178359890.

It can be divided in two parts, 1720 and 81718, that added together give a palindrome (83438).

The spelling of 172081718 in words is "one hundred seventy-two million, eighty-one thousand, seven hundred eighteen".