325166221 has 2 divisors, whose sum is σ = 325166222. Its totient is φ = 325166220.

The previous prime is 325166147. The next prime is 325166227. The reversal of 325166221 is 122661523.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210975625 + 114190596 = 14525^2 + 10686^2 .

It is a cyclic number.

It is not a de Polignac number, because 325166221 - 2¹¹ = 325164173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 325166221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (325166227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162583110 + 162583111.

It is an arithmetic number, because the mean of its divisors is an integer number (162583111).

Almost surely, 2^325166221 is an apocalyptic number.

It is an amenable number.

325166221 is a deficient number, since it is larger than the sum of its proper divisors (1).

325166221 is an equidigital number, since it uses as much as digits as its factorization.

325166221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 325166221 is about 18032.3659290732. The cubic root of 325166221 is about 687.6516265456.

The spelling of 325166221 in words is "three hundred twenty-five million, one hundred sixty-six thousand, two hundred twenty-one".