172531013 has 4 divisors (see below), whose sum is σ = 172566240. Its totient is φ = 172495788.

The previous prime is 172530991. The next prime is 172531019. The reversal of 172531013 is 310135271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172531013 - 2⁶ = 172530949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172531013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172531019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8795 + ... + 20552.

It is an arithmetic number, because the mean of its divisors is an integer number (43141560).

Almost surely, 2^172531013 is an apocalyptic number.

It is an amenable number.

172531013 is a deficient number, since it is larger than the sum of its proper divisors (35227).

172531013 is an equidigital number, since it uses as much as digits as its factorization.

172531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35226.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 172531013 is about 13135.1061282351. The cubic root of 172531013 is about 556.7014990495.

Adding to 172531013 its reverse (310135271), we get a palindrome (482666284).

The spelling of 172531013 in words is "one hundred seventy-two million, five hundred thirty-one thousand, thirteen".