80981813 has 8 divisors (see below), whose sum is σ = 88420896. Its totient is φ = 73555600.

The previous prime is 80981809. The next prime is 80981821. The reversal of 80981813 is 31818908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80981813 - 2² = 80981809 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 (80981113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13958 + ... + 18888.

It is an arithmetic number, because the mean of its divisors is an integer number (11052612).

Almost surely, 2^80981813 is an apocalyptic number.

It is an amenable number.

80981813 is a deficient number, since it is larger than the sum of its proper divisors (7439083).

80981813 is a wasteful number, since it uses less digits than its factorization.

80981813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435.

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 80981813 is about 8998.9895543889. The cubic root of 80981813 is about 432.6424857140.

The spelling of 80981813 in words is "eighty million, nine hundred eighty-one thousand, eight hundred thirteen".