981221333 has 2 divisors, whose sum is σ = 981221334. Its totient is φ = 981221332.

The previous prime is 981221327. The next prime is 981221387. The reversal of 981221333 is 333122189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504541444 + 476679889 = 22462^2 + 21833^2 .

It is an emirp because it is prime and its reverse (333122189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981221333 - 2⁸ = 981221077 is a prime.

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 981221333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981221233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490610666 + 490610667.

It is an arithmetic number, because the mean of its divisors is an integer number (490610667).

Almost surely, 2^981221333 is an apocalyptic number.

It is an amenable number.

981221333 is a deficient number, since it is larger than the sum of its proper divisors (1).

981221333 is an equidigital number, since it uses as much as digits as its factorization.

981221333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 981221333 is about 31324.4526368778. The cubic root of 981221333 is about 993.7008483370.

The spelling of 981221333 in words is "nine hundred eighty-one million, two hundred twenty-one thousand, three hundred thirty-three".