172881 has 16 divisors (see below), whose sum is σ = 270400. Its totient is φ = 108864.

The previous prime is 172877. The next prime is 172883. The reversal of 172881 is 188271.

It is not a de Polignac number, because 172881 - 2² = 172877 is a prime.

It is a super-2 number, since 2×172881² = 59775680322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

172881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (172883) 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, 345 + ... + 681.

It is an arithmetic number, because the mean of its divisors is an integer number (16900).

2¹⁷²⁸⁸¹ is an apocalyptic number.

It is an amenable number.

172881 is a deficient number, since it is larger than the sum of its proper divisors (97519).

172881 is a wasteful number, since it uses less digits than its factorization.

172881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 359 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 172881 is about 415.7896102598. The cubic root of 172881 is about 55.7077676229.

The spelling of 172881 in words is "one hundred seventy-two thousand, eight hundred eighty-one".