321969 has 4 divisors (see below), whose sum is σ = 429296. Its totient is φ = 214644.

The previous prime is 321961. The next prime is 321983. The reversal of 321969 is 969123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 321969 - 2³ = 321961 is a prime.

It is a super-2 number, since 2×321969² = 207328073922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53659 + ... + 53664.

It is an arithmetic number, because the mean of its divisors is an integer number (107324).

2³²¹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

321969 is a deficient number, since it is larger than the sum of its proper divisors (107327).

321969 is a wasteful number, since it uses less digits than its factorization.

321969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107326.

The product of its digits is 2916, while the sum is 30.

The square root of 321969 is about 567.4231225461. The cubic root of 321969 is about 68.5390403841.

It can be divided in two parts, 3219 and 69, that multiplied together give a triangular number (222111 = T₆₆₆).

The spelling of 321969 in words is "three hundred twenty-one thousand, nine hundred sixty-nine".