9881309 has 2 divisors, whose sum is σ = 9881310. Its totient is φ = 9881308.

The previous prime is 9881303. The next prime is 9881321. The reversal of 9881309 is 9031889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9703225 + 178084 = 3115^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881309 - 2¹² = 9877213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9881303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4940654 + 4940655.

It is an arithmetic number, because the mean of its divisors is an integer number (4940655).

Almost surely, 2^9881309 is an apocalyptic number.

It is an amenable number.

9881309 is a deficient number, since it is larger than the sum of its proper divisors (1).

9881309 is an equidigital number, since it uses as much as digits as its factorization.

9881309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 9881309 is about 3143.4549463926. The cubic root of 9881309 is about 214.5877009281.

The spelling of 9881309 in words is "nine million, eight hundred eighty-one thousand, three hundred nine".