321131089 has 2 divisors, whose sum is σ = 321131090. Its totient is φ = 321131088.

The previous prime is 321131087. The next prime is 321131099. The reversal of 321131089 is 980131123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308599489 + 12531600 = 17567^2 + 3540^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131089 - 2¹ = 321131087 is a prime.

Together with 321131087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (321131087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565544 + 160565545.

It is an arithmetic number, because the mean of its divisors is an integer number (160565545).

Almost surely, 2^321131089 is an apocalyptic number.

It is an amenable number.

321131089 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131089 is an equidigital number, since it uses as much as digits as its factorization.

321131089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 321131089 is about 17920.1308309956. The cubic root of 321131089 is about 684.7953205940.

The spelling of 321131089 in words is "three hundred twenty-one million, one hundred thirty-one thousand, eighty-nine".