322661 has 4 divisors (see below), whose sum is σ = 324300. Its totient is φ = 321024.

The previous prime is 322649. The next prime is 322669. The reversal of 322661 is 166223.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166223 = 113 ⋅1471.

It can be written as a sum of positive squares in 2 ways, for example, as 136900 + 185761 = 370^2 + 431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-322661 is a prime.

It is a super-2 number, since 2×322661² = 208220241842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (322669) 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, 476 + ... + 933.

It is an arithmetic number, because the mean of its divisors is an integer number (81075).

2³²²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

322661 is a deficient number, since it is larger than the sum of its proper divisors (1639).

322661 is a wasteful number, since it uses less digits than its factorization.

322661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638.

The product of its digits is 432, while the sum is 20.

The square root of 322661 is about 568.0325694888. The cubic root of 322661 is about 68.5881083349.

Adding to 322661 its reverse (166223), we get a palindrome (488884).

The spelling of 322661 in words is "three hundred twenty-two thousand, six hundred sixty-one".