172042287 has 4 divisors (see below), whose sum is σ = 229389720. Its totient is φ = 114694856.

The previous prime is 172042259. The next prime is 172042291. The reversal of 172042287 is 782240271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172042287 - 2⁶ = 172042223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172042217) 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 3 ways as a sum of consecutive naturals, for example, 28673712 + ... + 28673717.

It is an arithmetic number, because the mean of its divisors is an integer number (57347430).

Almost surely, 2^172042287 is an apocalyptic number.

172042287 is a deficient number, since it is larger than the sum of its proper divisors (57347433).

172042287 is an equidigital number, since it uses as much as digits as its factorization.

172042287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57347432.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 172042287 is about 13116.4891262868. The cubic root of 172042287 is about 556.1753486150.

It can be divided in two parts, 17204 and 2287, that added together give a palindrome (19491).

The spelling of 172042287 in words is "one hundred seventy-two million, forty-two thousand, two hundred eighty-seven".