84641609 has 8 divisors (see below), whose sum is σ = 91235592. Its totient is φ = 78059520.

The previous prime is 84641603. The next prime is 84641617. The reversal of 84641609 is 90614648.

It can be written as a sum of positive squares in 4 ways, for example, as 32035600 + 52606009 = 5660^2 + 7253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84641609 - 2⁴ = 84641593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84641603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16649 + ... + 21129.

It is an arithmetic number, because the mean of its divisors is an integer number (11404449).

Almost surely, 2^84641609 is an apocalyptic number.

It is an amenable number.

84641609 is a deficient number, since it is larger than the sum of its proper divisors (6593983).

84641609 is a wasteful number, since it uses less digits than its factorization.

84641609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5947.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 84641609 is about 9200.0874452366. The cubic root of 84641609 is about 439.0641420868.

The spelling of 84641609 in words is "eighty-four million, six hundred forty-one thousand, six hundred nine".