321961 has 2 divisors, whose sum is σ = 321962. Its totient is φ = 321960.

The previous prime is 321949. The next prime is 321983. The reversal of 321961 is 169123.

It is an a-pointer prime, because the next prime (321983) can be obtained adding 321961 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281961 + 40000 = 531^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 321961 - 2⁷ = 321833 is a prime.

It is not a weakly prime, because it can be changed into another prime (321901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160980 + 160981.

It is an arithmetic number, because the mean of its divisors is an integer number (160981).

2³²¹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

321961 is a deficient number, since it is larger than the sum of its proper divisors (1).

321961 is an equidigital number, since it uses as much as digits as its factorization.

321961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 22.

The square root of 321961 is about 567.4160730892. The cubic root of 321961 is about 68.5384727137.

The spelling of 321961 in words is "three hundred twenty-one thousand, nine hundred sixty-one".