172685881 has 9 divisors (see below), whose sum is σ = 183679021. Its totient is φ = 162317632.

The previous prime is 172685879. The next prime is 172685921. The reversal of 172685881 is 188586271.

The square root of 172685881 is 13141.

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

It can be written as a sum of positive squares in 4 ways, for example, as 9357481 + 163328400 = 3059^2 + 12780^2 .

It is not a de Polignac number, because 172685881 - 2¹ = 172685879 is a prime.

It is a super-2 number, since 2×172685881² = 59640826993492322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172685581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 223011 + ... + 223783.

Almost surely, 2^172685881 is an apocalyptic number.

172685881 is the 13141-st square number.

172685881 is the 6571-st centered octagonal number.

It is an amenable number.

172685881 is a deficient number, since it is larger than the sum of its proper divisors (10993140).

172685881 is an frugal number, since it uses more digits than its factorization.

172685881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580 (or 790 counting only the distinct ones).

The product of its digits is 215040, while the sum is 46.

The cubic root of 172685881 is about 556.8680188011.

The spelling of 172685881 in words is "one hundred seventy-two million, six hundred eighty-five thousand, eight hundred eighty-one".