981322709 has 2 divisors, whose sum is σ = 981322710. Its totient is φ = 981322708.

The previous prime is 981322679. The next prime is 981322711. The reversal of 981322709 is 907223189.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 981067684 + 255025 = 31322^2 + 505^2 .

It is an emirp because it is prime and its reverse (907223189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981322709 - 2²⁴ = 964545493 is a prime.

Together with 981322711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981322759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490661354 + 490661355.

It is an arithmetic number, because the mean of its divisors is an integer number (490661355).

Almost surely, 2^981322709 is an apocalyptic number.

It is an amenable number.

981322709 is a deficient number, since it is larger than the sum of its proper divisors (1).

981322709 is an equidigital number, since it uses as much as digits as its factorization.

981322709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 981322709 is about 31326.0707558417. The cubic root of 981322709 is about 993.7350689370.

The spelling of 981322709 in words is "nine hundred eighty-one million, three hundred twenty-two thousand, seven hundred nine".