172686361 has 2 divisors, whose sum is σ = 172686362. Its totient is φ = 172686360.

The previous prime is 172686359. The next prime is 172686373. The reversal of 172686361 is 163686271.

It is a happy number.

172686361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167210761 + 5475600 = 12931^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 172686361 - 2¹ = 172686359 is a prime.

Together with 172686359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (172686961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86343180 + 86343181.

It is an arithmetic number, because the mean of its divisors is an integer number (86343181).

Almost surely, 2^172686361 is an apocalyptic number.

It is an amenable number.

172686361 is a deficient number, since it is larger than the sum of its proper divisors (1).

172686361 is an equidigital number, since it uses as much as digits as its factorization.

172686361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 172686361 is about 13141.0182634376. The cubic root of 172686361 is about 556.8685347599.

The spelling of 172686361 in words is "one hundred seventy-two million, six hundred eighty-six thousand, three hundred sixty-one".