80918509 has 8 divisors (see below), whose sum is σ = 93297600. Its totient is φ = 68744256.

The previous prime is 80918507. The next prime is 80918527. The reversal of 80918509 is 90581908.

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

It is not a de Polignac number, because 80918509 - 2¹ = 80918507 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 (80918503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50359 + ... + 51940.

It is an arithmetic number, because the mean of its divisors is an integer number (11662200).

Almost surely, 2^80918509 is an apocalyptic number.

It is an amenable number.

80918509 is a deficient number, since it is larger than the sum of its proper divisors (12379091).

80918509 is a wasteful number, since it uses less digits than its factorization.

80918509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102419.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 80918509 is about 8995.4715829688. The cubic root of 80918509 is about 432.5297231959.

The spelling of 80918509 in words is "eighty million, nine hundred eighteen thousand, five hundred nine".