321319081 has 2 divisors, whose sum is σ = 321319082. Its totient is φ = 321319080.

The previous prime is 321319079. The next prime is 321319111. The reversal of 321319081 is 180913123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321305625 + 13456 = 17925^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 321319081 - 2¹ = 321319079 is a prime.

It is a super-2 number, since 2×321319081² = 206491903629369122, which contains 22 as substring.

Together with 321319079, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321319021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160659540 + 160659541.

It is an arithmetic number, because the mean of its divisors is an integer number (160659541).

Almost surely, 2^321319081 is an apocalyptic number.

It is an amenable number.

321319081 is a deficient number, since it is larger than the sum of its proper divisors (1).

321319081 is an equidigital number, since it uses as much as digits as its factorization.

321319081 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 321319081 is about 17925.3753377719. The cubic root of 321319081 is about 684.9289222430.

The spelling of 321319081 in words is "three hundred twenty-one million, three hundred nineteen thousand, eighty-one".