172520207 has 2 divisors, whose sum is σ = 172520208. Its totient is φ = 172520206.

The previous prime is 172520197. The next prime is 172520219. The reversal of 172520207 is 702025271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172520207 - 2⁶ = 172520143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172520287) 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 as a sum of consecutive naturals, namely, 86260103 + 86260104.

It is an arithmetic number, because the mean of its divisors is an integer number (86260104).

Almost surely, 2^172520207 is an apocalyptic number.

172520207 is a deficient number, since it is larger than the sum of its proper divisors (1).

172520207 is an equidigital number, since it uses as much as digits as its factorization.

172520207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 172520207 is about 13134.6947813796. The cubic root of 172520207 is about 556.6898763236.

Adding to 172520207 its reverse (702025271), we get a palindrome (874545478).

It can be divided in two parts, 1725 and 20207, that multiplied together give a triangular number (34857075 = T₈₃₄₉).

The spelling of 172520207 in words is "one hundred seventy-two million, five hundred twenty thousand, two hundred seven".