172687313 has 2 divisors, whose sum is σ = 172687314. Its totient is φ = 172687312.

The previous prime is 172687271. The next prime is 172687327. The reversal of 172687313 is 313786271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168558289 + 4129024 = 12983^2 + 2032^2 .

It is an emirp because it is prime and its reverse (313786271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172687313 - 2⁸ = 172687057 is a prime.

It is not a weakly prime, because it can be changed into another prime (172687913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86343656 + 86343657.

It is an arithmetic number, because the mean of its divisors is an integer number (86343657).

Almost surely, 2^172687313 is an apocalyptic number.

It is an amenable number.

172687313 is a deficient number, since it is larger than the sum of its proper divisors (1).

172687313 is an equidigital number, since it uses as much as digits as its factorization.

172687313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 172687313 is about 13141.0544858470. The cubic root of 172687313 is about 556.8695580754.

The spelling of 172687313 in words is "one hundred seventy-two million, six hundred eighty-seven thousand, three hundred thirteen".