321418561 has 2 divisors, whose sum is σ = 321418562. Its totient is φ = 321418560.

The previous prime is 321418547. The next prime is 321418589. The reversal of 321418561 is 165814123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318408336 + 3010225 = 17844^2 + 1735^2 .

It is an emirp because it is prime and its reverse (165814123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321418561 - 2⁵ = 321418529 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (321418501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160709280 + 160709281.

It is an arithmetic number, because the mean of its divisors is an integer number (160709281).

Almost surely, 2^321418561 is an apocalyptic number.

It is an amenable number.

321418561 is a deficient number, since it is larger than the sum of its proper divisors (1).

321418561 is an equidigital number, since it uses as much as digits as its factorization.

321418561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 321418561 is about 17928.1499603278. The cubic root of 321418561 is about 684.9995993391. Note that the first 3 decimals are identical.

The spelling of 321418561 in words is "three hundred twenty-one million, four hundred eighteen thousand, five hundred sixty-one".