80981071 has 4 divisors (see below), whose sum is σ = 81497032. Its totient is φ = 80465112.

The previous prime is 80981057. The next prime is 80981077. The reversal of 80981071 is 17018908.

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 80981071 - 2⁷ = 80980943 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 (80981077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257745 + ... + 258058.

It is an arithmetic number, because the mean of its divisors is an integer number (20374258).

Almost surely, 2^80981071 is an apocalyptic number.

80981071 is a deficient number, since it is larger than the sum of its proper divisors (515961).

80981071 is a wasteful number, since it uses less digits than its factorization.

80981071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515960.

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

The square root of 80981071 is about 8998.9483274436. The cubic root of 80981071 is about 432.6411643404.

Adding to 80981071 its reverse (17018908), we get a palindrome (97999979).

The spelling of 80981071 in words is "eighty million, nine hundred eighty-one thousand, seventy-one".