172531885 has 8 divisors (see below), whose sum is σ = 207122040. Its totient is φ = 137969664.

The previous prime is 172531873. The next prime is 172531889. The reversal of 172531885 is 588135271.

It can be written as a sum of positive squares in 4 ways, for example, as 59938564 + 112593321 = 7742^2 + 10611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172531885 - 2⁷ = 172531757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172531889) 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 7 ways as a sum of consecutive naturals, for example, 10669 + ... + 21421.

It is an arithmetic number, because the mean of its divisors is an integer number (25890255).

Almost surely, 2^172531885 is an apocalyptic number.

It is an amenable number.

172531885 is a deficient number, since it is larger than the sum of its proper divisors (34590155).

172531885 is a wasteful number, since it uses less digits than its factorization.

172531885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13967.

The product of its digits is 67200, while the sum is 40.

The square root of 172531885 is about 13135.1393216821. The cubic root of 172531885 is about 556.7024369347.

The spelling of 172531885 in words is "one hundred seventy-two million, five hundred thirty-one thousand, eight hundred eighty-five".