321105881 has 2 divisors, whose sum is σ = 321105882. Its totient is φ = 321105880.

The previous prime is 321105857. The next prime is 321105887. The reversal of 321105881 is 188501123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280897600 + 40208281 = 16760^2 + 6341^2 .

It is a cyclic number.

It is not a de Polignac number, because 321105881 - 2⁶ = 321105817 is a prime.

It is a super-2 number, since 2×321105881² = 206217973625572322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321105887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160552940 + 160552941.

It is an arithmetic number, because the mean of its divisors is an integer number (160552941).

Almost surely, 2^321105881 is an apocalyptic number.

It is an amenable number.

321105881 is a deficient number, since it is larger than the sum of its proper divisors (1).

321105881 is an equidigital number, since it uses as much as digits as its factorization.

321105881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 321105881 is about 17919.4274741131. The cubic root of 321105881 is about 684.7774018761. Note that the first 3 decimals are identical.

The spelling of 321105881 in words is "three hundred twenty-one million, one hundred five thousand, eight hundred eighty-one".