321053561 has 2 divisors, whose sum is σ = 321053562. Its totient is φ = 321053560.

The previous prime is 321053533. The next prime is 321053563. The reversal of 321053561 is 165350123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169000000 + 152053561 = 13000^2 + 12331^2 .

It is a cyclic number.

It is not a de Polignac number, because 321053561 - 2¹⁴ = 321037177 is a prime.

Together with 321053563, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321053561.

It is not a weakly prime, because it can be changed into another prime (321053563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160526780 + 160526781.

It is an arithmetic number, because the mean of its divisors is an integer number (160526781).

Almost surely, 2^321053561 is an apocalyptic number.

It is an amenable number.

321053561 is a deficient number, since it is larger than the sum of its proper divisors (1).

321053561 is an equidigital number, since it uses as much as digits as its factorization.

321053561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 321053561 is about 17917.9675465718. The cubic root of 321053561 is about 684.7402080180.

The spelling of 321053561 in words is "three hundred twenty-one million, fifty-three thousand, five hundred sixty-one".