84083509 has 2 divisors, whose sum is σ = 84083510. Its totient is φ = 84083508.

The previous prime is 84083507. The next prime is 84083537. The reversal of 84083509 is 90538048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 10381284 = 8585^2 + 3222^2 .

It is a cyclic number.

It is not a de Polignac number, because 84083509 - 2¹ = 84083507 is a prime.

Together with 84083507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84083507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42041754 + 42041755.

It is an arithmetic number, because the mean of its divisors is an integer number (42041755).

Almost surely, 2^84083509 is an apocalyptic number.

It is an amenable number.

84083509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84083509 is an equidigital number, since it uses as much as digits as its factorization.

84083509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 84083509 is about 9169.7060476332. The cubic root of 84083509 is about 438.0969965815.

The spelling of 84083509 in words is "eighty-four million, eighty-three thousand, five hundred nine".