80391909 has 8 divisors (see below), whose sum is σ = 115434592. Its totient is φ = 49471920.

The previous prime is 80391887. The next prime is 80391911. The reversal of 80391909 is 90919308.

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

It is not a de Polignac number, because 80391909 - 2¹³ = 80383717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2061331 = 80391909 / (8 + 0 + 3 + 9 + 1 + 9 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80391979) 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, 1030627 + ... + 1030704.

It is an arithmetic number, because the mean of its divisors is an integer number (14429324).

Almost surely, 2^80391909 is an apocalyptic number.

It is an amenable number.

80391909 is a deficient number, since it is larger than the sum of its proper divisors (35042683).

80391909 is a wasteful number, since it uses less digits than its factorization.

80391909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061347.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 80391909 is about 8966.1535231112. The cubic root of 80391909 is about 431.5894107671.

The spelling of 80391909 in words is "eighty million, three hundred ninety-one thousand, nine hundred nine".