172522813 has 2 divisors, whose sum is σ = 172522814. Its totient is φ = 172522812.

The previous prime is 172522799. The next prime is 172522879. The reversal of 172522813 is 318225271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166848889 + 5673924 = 12917^2 + 2382^2 .

It is a cyclic number.

It is not a de Polignac number, because 172522813 - 2¹⁷ = 172391741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172522513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86261406 + 86261407.

It is an arithmetic number, because the mean of its divisors is an integer number (86261407).

Almost surely, 2^172522813 is an apocalyptic number.

It is an amenable number.

172522813 is a deficient number, since it is larger than the sum of its proper divisors (1).

172522813 is an equidigital number, since it uses as much as digits as its factorization.

172522813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 172522813 is about 13134.7939839192. The cubic root of 172522813 is about 556.6926793315.

The spelling of 172522813 in words is "one hundred seventy-two million, five hundred twenty-two thousand, eight hundred thirteen".