921444313 has 2 divisors, whose sum is σ = 921444314. Its totient is φ = 921444312.

The previous prime is 921444221. The next prime is 921444361. The reversal of 921444313 is 313444129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834805449 + 86638864 = 28893^2 + 9308^2 .

It is an emirp because it is prime and its reverse (313444129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921444313 - 2²¹ = 919347161 is a prime.

It is not a weakly prime, because it can be changed into another prime (921448313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460722156 + 460722157.

It is an arithmetic number, because the mean of its divisors is an integer number (460722157).

Almost surely, 2^921444313 is an apocalyptic number.

It is an amenable number.

921444313 is a deficient number, since it is larger than the sum of its proper divisors (1).

921444313 is an equidigital number, since it uses as much as digits as its factorization.

921444313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 921444313 is about 30355.3012338866. The cubic root of 921444313 is about 973.0975176072.

The spelling of 921444313 in words is "nine hundred twenty-one million, four hundred forty-four thousand, three hundred thirteen".