80811971 has 4 divisors (see below), whose sum is σ = 80837952. Its totient is φ = 80785992.

The previous prime is 80811967. The next prime is 80811979. The reversal of 80811971 is 17911808.

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 80811971 - 2² = 80811967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80811979) 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, 7571 + ... + 14796.

It is an arithmetic number, because the mean of its divisors is an integer number (20209488).

Almost surely, 2^80811971 is an apocalyptic number.

80811971 is a deficient number, since it is larger than the sum of its proper divisors (25981).

80811971 is a wasteful number, since it uses less digits than its factorization.

80811971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25980.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 80811971 is about 8989.5478751715. The cubic root of 80811971 is about 432.3398157177.

The spelling of 80811971 in words is "eighty million, eight hundred eleven thousand, nine hundred seventy-one".