321989971 has 2 divisors, whose sum is σ = 321989972. Its totient is φ = 321989970.

The previous prime is 321989881. The next prime is 321989989. The reversal of 321989971 is 179989123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321989971 - 2¹⁷ = 321858899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321959971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160994985 + 160994986.

It is an arithmetic number, because the mean of its divisors is an integer number (160994986).

Almost surely, 2^321989971 is an apocalyptic number.

321989971 is a deficient number, since it is larger than the sum of its proper divisors (1).

321989971 is an equidigital number, since it uses as much as digits as its factorization.

321989971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 321989971 is about 17944.0789955907. The cubic root of 321989971 is about 685.4052841664.

The spelling of 321989971 in words is "three hundred twenty-one million, nine hundred eighty-nine thousand, nine hundred seventy-one".