80916691 has 4 divisors (see below), whose sum is σ = 84434832. Its totient is φ = 77398552.

The previous prime is 80916659. The next prime is 80916767. The reversal of 80916691 is 19661908.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80916691 - 2⁵ = 80916659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80916091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759036 + ... + 1759081.

It is an arithmetic number, because the mean of its divisors is an integer number (21108708).

Almost surely, 2^80916691 is an apocalyptic number.

80916691 is a deficient number, since it is larger than the sum of its proper divisors (3518141).

80916691 is a wasteful number, since it uses less digits than its factorization.

80916691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518140.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 80916691 is about 8995.3705315568. The cubic root of 80916691 is about 432.5264839496.

The spelling of 80916691 in words is "eighty million, nine hundred sixteen thousand, six hundred ninety-one".