172130681 has 2 divisors, whose sum is σ = 172130682. Its totient is φ = 172130680.

The previous prime is 172130641. The next prime is 172130687. The reversal of 172130681 is 186031271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170955625 + 1175056 = 13075^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 172130681 - 2⁶ = 172130617 is a prime.

It is a super-2 number, since 2×172130681² = 59257942683047522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172130687) 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 as a sum of consecutive naturals, namely, 86065340 + 86065341.

It is an arithmetic number, because the mean of its divisors is an integer number (86065341).

Almost surely, 2^172130681 is an apocalyptic number.

It is an amenable number.

172130681 is a deficient number, since it is larger than the sum of its proper divisors (1).

172130681 is an equidigital number, since it uses as much as digits as its factorization.

172130681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 172130681 is about 13119.8582690515. The cubic root of 172130681 is about 556.2705851743.

The spelling of 172130681 in words is "one hundred seventy-two million, one hundred thirty thousand, six hundred eighty-one".