321271289 has 2 divisors, whose sum is σ = 321271290. Its totient is φ = 321271288.

The previous prime is 321271271. The next prime is 321271373. The reversal of 321271289 is 982172123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197683600 + 123587689 = 14060^2 + 11117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321271289 is a prime.

It is a super-2 number, since 2×321271289² = 206430482271443042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (321271789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160635644 + 160635645.

It is an arithmetic number, because the mean of its divisors is an integer number (160635645).

Almost surely, 2^321271289 is an apocalyptic number.

It is an amenable number.

321271289 is a deficient number, since it is larger than the sum of its proper divisors (1).

321271289 is an equidigital number, since it uses as much as digits as its factorization.

321271289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 321271289 is about 17924.0422059311. The cubic root of 321271289 is about 684.8949624939.

The spelling of 321271289 in words is "three hundred twenty-one million, two hundred seventy-one thousand, two hundred eighty-nine".