321988741 has 2 divisors, whose sum is σ = 321988742. Its totient is φ = 321988740.

The previous prime is 321988729. The next prime is 321988757. The reversal of 321988741 is 147889123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284900641 + 37088100 = 16879^2 + 6090^2 .

It is a cyclic number.

It is not a de Polignac number, because 321988741 - 2⁹ = 321988229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321988781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160994370 + 160994371.

It is an arithmetic number, because the mean of its divisors is an integer number (160994371).

Almost surely, 2^321988741 is an apocalyptic number.

It is an amenable number.

321988741 is a deficient number, since it is larger than the sum of its proper divisors (1).

321988741 is an equidigital number, since it uses as much as digits as its factorization.

321988741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 321988741 is about 17944.0447224142. The cubic root of 321988741 is about 685.4044114171.

The spelling of 321988741 in words is "three hundred twenty-one million, nine hundred eighty-eight thousand, seven hundred forty-one".