9861409 has 2 divisors, whose sum is σ = 9861410. Its totient is φ = 9861408.

The previous prime is 9861407. The next prime is 9861413. The reversal of 9861409 is 9041689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8573184 + 1288225 = 2928^2 + 1135^2 .

It is a cyclic number.

It is not a de Polignac number, because 9861409 - 2¹ = 9861407 is a prime.

Together with 9861407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9861407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4930704 + 4930705.

It is an arithmetic number, because the mean of its divisors is an integer number (4930705).

Almost surely, 2^9861409 is an apocalyptic number.

It is an amenable number.

9861409 is a deficient number, since it is larger than the sum of its proper divisors (1).

9861409 is an equidigital number, since it uses as much as digits as its factorization.

9861409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 9861409 is about 3140.2880441132. The cubic root of 9861409 is about 214.4435511630.

The spelling of 9861409 in words is "nine million, eight hundred sixty-one thousand, four hundred nine".