84556509 has 4 divisors (see below), whose sum is σ = 112742016. Its totient is φ = 56371004.

The previous prime is 84556501. The next prime is 84556519. The reversal of 84556509 is 90565548.

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 84556509 - 2³ = 84556501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84556501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14092749 + ... + 14092754.

It is an arithmetic number, because the mean of its divisors is an integer number (28185504).

Almost surely, 2^84556509 is an apocalyptic number.

It is an amenable number.

84556509 is a deficient number, since it is larger than the sum of its proper divisors (28185507).

84556509 is a wasteful number, since it uses less digits than its factorization.

84556509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28185506.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 84556509 is about 9195.4613261108. The cubic root of 84556509 is about 438.9169454217.

The spelling of 84556509 in words is "eighty-four million, five hundred fifty-six thousand, five hundred nine".