172281473 has 24 divisors (see below), whose sum is σ = 214962048. Its totient is φ = 135188352.

The previous prime is 172281463. The next prime is 172281481. The reversal of 172281473 is 374182271.

It is not a de Polignac number, because 172281473 - 2²² = 168087169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172281413) 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 23 ways as a sum of consecutive naturals, for example, 161540 + ... + 162602.

It is an arithmetic number, because the mean of its divisors is an integer number (8956752).

Almost surely, 2^172281473 is an apocalyptic number.

172281473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

172281473 is a deficient number, since it is larger than the sum of its proper divisors (42680575).

172281473 is a wasteful number, since it uses less digits than its factorization.

172281473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1220 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 172281473 is about 13125.6037194485. The cubic root of 172281473 is about 556.4329747249.

The spelling of 172281473 in words is "one hundred seventy-two million, two hundred eighty-one thousand, four hundred seventy-three".