80071891 has 16 divisors (see below), whose sum is σ = 84015360. Its totient is φ = 76255200.

The previous prime is 80071889. The next prime is 80071907. The reversal of 80071891 is 19817008.

It is a cyclic number.

It is not a de Polignac number, because 80071891 - 2¹ = 80071889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80071801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447240 + ... + 447418.

It is an arithmetic number, because the mean of its divisors is an integer number (5250960).

Almost surely, 2^80071891 is an apocalyptic number.

80071891 is a deficient number, since it is larger than the sum of its proper divisors (3943469).

80071891 is a wasteful number, since it uses less digits than its factorization.

80071891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426.

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

The square root of 80071891 is about 8948.2898366112. The cubic root of 80071891 is about 431.0159697501.

Adding to 80071891 its reverse (19817008), we get a palindrome (99888899).

The spelling of 80071891 in words is "eighty million, seventy-one thousand, eight hundred ninety-one".