84425509 has 4 divisors (see below), whose sum is σ = 96486304. Its totient is φ = 72364716.

The previous prime is 84425503. The next prime is 84425513. The reversal of 84425509 is 90552448.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84425509 - 2¹⁷ = 84294437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84425503) 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 in 3 ways as a sum of consecutive naturals, for example, 6030387 + ... + 6030400.

It is an arithmetic number, because the mean of its divisors is an integer number (24121576).

Almost surely, 2^84425509 is an apocalyptic number.

It is an amenable number.

84425509 is a deficient number, since it is larger than the sum of its proper divisors (12060795).

84425509 is a wasteful number, since it uses less digits than its factorization.

84425509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060794.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 84425509 is about 9188.3354858211. The cubic root of 84425509 is about 438.6901628069.

The spelling of 84425509 in words is "eighty-four million, four hundred twenty-five thousand, five hundred nine".