172206613 has 2 divisors, whose sum is σ = 172206614. Its totient is φ = 172206612.

The previous prime is 172206563. The next prime is 172206623. The reversal of 172206613 is 316602271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169572484 + 2634129 = 13022^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 172206613 - 2¹³ = 172198421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172206623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86103306 + 86103307.

It is an arithmetic number, because the mean of its divisors is an integer number (86103307).

Almost surely, 2^172206613 is an apocalyptic number.

It is an amenable number.

172206613 is a deficient number, since it is larger than the sum of its proper divisors (1).

172206613 is an equidigital number, since it uses as much as digits as its factorization.

172206613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 172206613 is about 13122.7517312491. The cubic root of 172206613 is about 556.3523690229.

Adding to 172206613 its reverse (316602271), we get a palindrome (488808884).

The spelling of 172206613 in words is "one hundred seventy-two million, two hundred six thousand, six hundred thirteen".