80564609 has 4 divisors (see below), whose sum is σ = 81199104. Its totient is φ = 79930116.

The previous prime is 80564597. The next prime is 80564621. The reversal of 80564609 is 90646508.

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 an interprime number because it is at equal distance from previous prime (80564597) and next prime (80564621).

It is a cyclic number.

It is not a de Polignac number, because 80564609 - 2⁸ = 80564353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80560609) 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, 317057 + ... + 317310.

It is an arithmetic number, because the mean of its divisors is an integer number (20299776).

Almost surely, 2^80564609 is an apocalyptic number.

It is an amenable number.

80564609 is a deficient number, since it is larger than the sum of its proper divisors (634495).

80564609 is a wasteful number, since it uses less digits than its factorization.

80564609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634494.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 80564609 is about 8975.7790191158. The cubic root of 80564609 is about 431.8982402780.

The spelling of 80564609 in words is "eighty million, five hundred sixty-four thousand, six hundred nine".