172521242 has 4 divisors (see below), whose sum is σ = 258781866. Its totient is φ = 86260620.

The previous prime is 172521241. The next prime is 172521263. The reversal of 172521242 is 242125271.

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

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 45711121 = 11261^2 + 6761^2 .

It is not an unprimeable number, because it can be changed into a prime (172521241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43130309 + ... + 43130312.

Almost surely, 2^172521242 is an apocalyptic number.

172521242 is a deficient number, since it is larger than the sum of its proper divisors (86260624).

172521242 is an equidigital number, since it uses as much as digits as its factorization.

172521242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86260623.

The product of its digits is 2240, while the sum is 26.

The square root of 172521242 is about 13134.7341807895. The cubic root of 172521242 is about 556.6909895707.

The spelling of 172521242 in words is "one hundred seventy-two million, five hundred twenty-one thousand, two hundred forty-two".