80811709 has 8 divisors (see below), whose sum is σ = 88512480. Its totient is φ = 73170000.

The previous prime is 80811701. The next prime is 80811743. The reversal of 80811709 is 90711808.

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 80811709 - 2³ = 80811701 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 (80811701) 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, 11874 + ... + 17395.

It is an arithmetic number, because the mean of its divisors is an integer number (11064060).

Almost surely, 2^80811709 is an apocalyptic number.

It is an amenable number.

80811709 is a deficient number, since it is larger than the sum of its proper divisors (7700771).

80811709 is a wasteful number, since it uses less digits than its factorization.

80811709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29531.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 80811709 is about 8989.5333026804. The cubic root of 80811709 is about 432.3393484885.

Subtracting 80811709 from its reverse (90711808), we obtain a palindrome (9900099).

The spelling of 80811709 in words is "eighty million, eight hundred eleven thousand, seven hundred nine".