8542409 has 2 divisors, whose sum is σ = 8542410. Its totient is φ = 8542408.

The previous prime is 8542367. The next prime is 8542411. The reversal of 8542409 is 9042458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 2166784 = 2525^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 8542409 - 2²⁰ = 7493833 is a prime.

Together with 8542411, 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 (8542459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4271204 + 4271205.

It is an arithmetic number, because the mean of its divisors is an integer number (4271205).

Almost surely, 2^8542409 is an apocalyptic number.

It is an amenable number.

8542409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8542409 is an equidigital number, since it uses as much as digits as its factorization.

8542409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 8542409 is about 2922.7399815926. The cubic root of 8542409 is about 204.4216018136.

The spelling of 8542409 in words is "eight million, five hundred forty-two thousand, four hundred nine".