172045281 has 4 divisors (see below), whose sum is σ = 229393712. Its totient is φ = 114696852.

The previous prime is 172045243. The next prime is 172045297. The reversal of 172045281 is 182540271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 172045281 - 2⁶ = 172045217 is a prime.

It is a super-2 number, since 2×172045281² = 59199157428737922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172045241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28674211 + ... + 28674216.

It is an arithmetic number, because the mean of its divisors is an integer number (57348428).

Almost surely, 2^172045281 is an apocalyptic number.

It is an amenable number.

172045281 is a deficient number, since it is larger than the sum of its proper divisors (57348431).

172045281 is an equidigital number, since it uses as much as digits as its factorization.

172045281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57348430.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 172045281 is about 13116.6032569412. The cubic root of 172045281 is about 556.1785749136.

The spelling of 172045281 in words is "one hundred seventy-two million, forty-five thousand, two hundred eighty-one".