172218601 has 2 divisors, whose sum is σ = 172218602. Its totient is φ = 172218600.

The previous prime is 172218593. The next prime is 172218643. The reversal of 172218601 is 106812271.

172218601 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., 153165376 + 19053225 = 12376^2 + 4365^2 .

It is a cyclic number.

It is not a de Polignac number, because 172218601 - 2³ = 172218593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172218601.

It is not a weakly prime, because it can be changed into another prime (172218301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86109300 + 86109301.

It is an arithmetic number, because the mean of its divisors is an integer number (86109301).

Almost surely, 2^172218601 is an apocalyptic number.

It is an amenable number.

172218601 is a deficient number, since it is larger than the sum of its proper divisors (1).

172218601 is an equidigital number, since it uses as much as digits as its factorization.

172218601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 172218601 is about 13123.2084872565. The cubic root of 172218601 is about 556.3652787042.

The spelling of 172218601 in words is "one hundred seventy-two million, two hundred eighteen thousand, six hundred one".