321616201 has 2 divisors, whose sum is σ = 321616202. Its totient is φ = 321616200.

The previous prime is 321616171. The next prime is 321616223. The reversal of 321616201 is 102616123.

It is an a-pointer prime, because the next prime (321616223) can be obtained adding 321616201 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296666176 + 24950025 = 17224^2 + 4995^2 .

It is a cyclic number.

It is not a de Polignac number, because 321616201 - 2²⁵ = 288061769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321616241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160808100 + 160808101.

It is an arithmetic number, because the mean of its divisors is an integer number (160808101).

Almost surely, 2^321616201 is an apocalyptic number.

It is an amenable number.

321616201 is a deficient number, since it is larger than the sum of its proper divisors (1).

321616201 is an equidigital number, since it uses as much as digits as its factorization.

321616201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 321616201 is about 17933.6611153440. The cubic root of 321616201 is about 685.1399724618.

The spelling of 321616201 in words is "three hundred twenty-one million, six hundred sixteen thousand, two hundred one".