321120061 has 2 divisors, whose sum is σ = 321120062. Its totient is φ = 321120060.

The previous prime is 321120053. The next prime is 321120091. The reversal of 321120061 is 160021123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249039961 + 72080100 = 15781^2 + 8490^2 .

It is an emirp because it is prime and its reverse (160021123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321120061 - 2³ = 321120053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321120091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160560030 + 160560031.

It is an arithmetic number, because the mean of its divisors is an integer number (160560031).

Almost surely, 2^321120061 is an apocalyptic number.

It is an amenable number.

321120061 is a deficient number, since it is larger than the sum of its proper divisors (1).

321120061 is an equidigital number, since it uses as much as digits as its factorization.

321120061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 321120061 is about 17919.8231297075. The cubic root of 321120061 is about 684.7874816257.

Adding to 321120061 its reverse (160021123), we get a palindrome (481141184).

The spelling of 321120061 in words is "three hundred twenty-one million, one hundred twenty thousand, sixty-one".