172521006 has 16 divisors (see below), whose sum is σ = 394333824. Its totient is φ = 49291704.

The previous prime is 172521001. The next prime is 172521023. The reversal of 172521006 is 600125271.

It is a super-2 number, since 2×172521006² = 59526995022504072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172521001) 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 in 7 ways as a sum of consecutive naturals, for example, 2053780 + ... + 2053863.

It is an arithmetic number, because the mean of its divisors is an integer number (24645864).

Almost surely, 2^172521006 is an apocalyptic number.

172521006 is an abundant number, since it is smaller than the sum of its proper divisors (221812818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172521006 is a wasteful number, since it uses less digits than its factorization.

172521006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107655.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 172521006 is about 13134.7251969731. The cubic root of 172521006 is about 556.6907357293.

Adding to 172521006 its reverse (600125271), we get a palindrome (772646277).

The spelling of 172521006 in words is "one hundred seventy-two million, five hundred twenty-one thousand, six".