321616241 has 2 divisors, whose sum is σ = 321616242. Its totient is φ = 321616240.

The previous prime is 321616223. The next prime is 321616277. The reversal of 321616241 is 142616123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311875600 + 9740641 = 17660^2 + 3121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321616241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321616241.

It is not a weakly prime, because it can be changed into another prime (321616201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160808120 + 160808121.

It is an arithmetic number, because the mean of its divisors is an integer number (160808121).

Almost surely, 2^321616241 is an apocalyptic number.

It is an amenable number.

321616241 is a deficient number, since it is larger than the sum of its proper divisors (1).

321616241 is an equidigital number, since it uses as much as digits as its factorization.

321616241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 321616241 is about 17933.6622305652. The cubic root of 321616241 is about 685.1400008658.

The spelling of 321616241 in words is "three hundred twenty-one million, six hundred sixteen thousand, two hundred forty-one".