321961361 has 2 divisors, whose sum is σ = 321961362. Its totient is φ = 321961360.

The previous prime is 321961307. The next prime is 321961363. The reversal of 321961361 is 163169123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266309761 + 55651600 = 16319^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 321961361 - 2¹⁰ = 321960337 is a prime.

It is a Sophie Germain prime.

Together with 321961363, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (321961363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160980680 + 160980681.

It is an arithmetic number, because the mean of its divisors is an integer number (160980681).

Almost surely, 2^321961361 is an apocalyptic number.

It is an amenable number.

321961361 is a deficient number, since it is larger than the sum of its proper divisors (1).

321961361 is an equidigital number, since it uses as much as digits as its factorization.

321961361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 321961361 is about 17943.2817789835. The cubic root of 321961361 is about 685.3849833001.

The spelling of 321961361 in words is "three hundred twenty-one million, nine hundred sixty-one thousand, three hundred sixty-one".