985427309 has 2 divisors, whose sum is σ = 985427310. Its totient is φ = 985427308.

The previous prime is 985427297. The next prime is 985427347. The reversal of 985427309 is 903724589.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948824809 + 36602500 = 30803^2 + 6050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985427309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985427369) 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, 492713654 + 492713655.

It is an arithmetic number, because the mean of its divisors is an integer number (492713655).

Almost surely, 2^985427309 is an apocalyptic number.

It is an amenable number.

985427309 is a deficient number, since it is larger than the sum of its proper divisors (1).

985427309 is an equidigital number, since it uses as much as digits as its factorization.

985427309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 985427309 is about 31391.5165132238. The cubic root of 985427309 is about 995.1186475014.

The spelling of 985427309 in words is "nine hundred eighty-five million, four hundred twenty-seven thousand, three hundred nine".