172531073 has 16 divisors (see below), whose sum is σ = 211510656. Its totient is φ = 138483840.

The previous prime is 172531069. The next prime is 172531081. The reversal of 172531073 is 370135271.

It is not a de Polignac number, because 172531073 - 2² = 172531069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172531043) 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 15 ways as a sum of consecutive naturals, for example, 22940 + ... + 29517.

It is an arithmetic number, because the mean of its divisors is an integer number (13219416).

Almost surely, 2^172531073 is an apocalyptic number.

172531073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

172531073 is a deficient number, since it is larger than the sum of its proper divisors (38979583).

172531073 is a wasteful number, since it uses less digits than its factorization.

172531073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52504.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 172531073 is about 13135.1084121906. The cubic root of 172531073 is about 556.7015635830.

The spelling of 172531073 in words is "one hundred seventy-two million, five hundred thirty-one thousand, seventy-three".