984565409 has 2 divisors, whose sum is σ = 984565410. Its totient is φ = 984565408.

The previous prime is 984565397. The next prime is 984565411. The reversal of 984565409 is 904565489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594384400 + 390181009 = 24380^2 + 19753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-984565409 is a prime.

Together with 984565411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (984565429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492282704 + 492282705.

It is an arithmetic number, because the mean of its divisors is an integer number (492282705).

Almost surely, 2^984565409 is an apocalyptic number.

It is an amenable number.

984565409 is a deficient number, since it is larger than the sum of its proper divisors (1).

984565409 is an equidigital number, since it uses as much as digits as its factorization.

984565409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 984565409 is about 31377.7852787605. The cubic root of 984565409 is about 994.8284373780.

The spelling of 984565409 in words is "nine hundred eighty-four million, five hundred sixty-five thousand, four hundred nine".