80811993 has 4 divisors (see below), whose sum is σ = 107749328. Its totient is φ = 53874660.

The previous prime is 80811989. The next prime is 80812001. The reversal of 80811993 is 39911808.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80811993 - 2² = 80811989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80811923) 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, 13468663 + ... + 13468668.

It is an arithmetic number, because the mean of its divisors is an integer number (26937332).

Almost surely, 2^80811993 is an apocalyptic number.

It is an amenable number.

80811993 is a deficient number, since it is larger than the sum of its proper divisors (26937335).

80811993 is a wasteful number, since it uses less digits than its factorization.

80811993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26937334.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 80811993 is about 8989.5490988147. The cubic root of 80811993 is about 432.3398549507.

The spelling of 80811993 in words is "eighty million, eight hundred eleven thousand, nine hundred ninety-three".