80649971 has 4 divisors (see below), whose sum is σ = 81481512. Its totient is φ = 79818432.

The previous prime is 80649929. The next prime is 80649997. The reversal of 80649971 is 17994608.

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 80649971 - 2¹⁰ = 80648947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80649901) 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 3 ways as a sum of consecutive naturals, for example, 415625 + ... + 415818.

It is an arithmetic number, because the mean of its divisors is an integer number (20370378).

Almost surely, 2^80649971 is an apocalyptic number.

80649971 is a deficient number, since it is larger than the sum of its proper divisors (831541).

80649971 is an equidigital number, since it uses as much as digits as its factorization.

80649971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831540.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 80649971 is about 8980.5328906474. The cubic root of 80649971 is about 432.0507252822.

The spelling of 80649971 in words is "eighty million, six hundred forty-nine thousand, nine hundred seventy-one".