80109909 has 24 divisors (see below), whose sum is σ = 132880800. Its totient is φ = 45995040.

The previous prime is 80109893. The next prime is 80109917. The reversal of 80109909 is 90990108.

It is not a de Polignac number, because 80109909 - 2⁴ = 80109893 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 (80109929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19414 + ... + 23175.

It is an arithmetic number, because the mean of its divisors is an integer number (5536700).

Almost surely, 2^80109909 is an apocalyptic number.

It is an amenable number.

80109909 is a deficient number, since it is larger than the sum of its proper divisors (52770891).

80109909 is a wasteful number, since it uses less digits than its factorization.

80109909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42625 (or 42622 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 80109909 is about 8950.4139010439. The cubic root of 80109909 is about 431.0841741774.

It can be divided in two parts, 80109 and 909, that added together give a palindrome (81018).

The spelling of 80109909 in words is "eighty million, one hundred nine thousand, nine hundred nine".