321881 has 6 divisors (see below), whose sum is σ = 374490. Its totient is φ = 275856.

The previous prime is 321851. The next prime is 321889. The reversal of 321881 is 188123.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 8281 = 560^2 + 91^2 .

It is not a de Polignac number, because 321881 - 2⁶ = 321817 is a prime.

It is a super-2 number, since 2×321881² = 207214756322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321889) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3236 + ... + 3333.

It is an arithmetic number, because the mean of its divisors is an integer number (62415).

2³²¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

321881 is a deficient number, since it is larger than the sum of its proper divisors (52609).

321881 is an equidigital number, since it uses as much as digits as its factorization.

321881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6583 (or 6576 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 321881 is about 567.3455737027. The cubic root of 321881 is about 68.5327954919.

The spelling of 321881 in words is "three hundred twenty-one thousand, eight hundred eighty-one".