80491993 has 4 divisors (see below), whose sum is σ = 80574208. Its totient is φ = 80409780.

The previous prime is 80491963. The next prime is 80492017. The reversal of 80491993 is 39919408.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80491993 is a prime.

It is a super-2 number, since 2×80491993² = 12957921874224098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80491913) 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, 39621 + ... + 41602.

It is an arithmetic number, because the mean of its divisors is an integer number (20143552).

Almost surely, 2^80491993 is an apocalyptic number.

It is an amenable number.

80491993 is a deficient number, since it is larger than the sum of its proper divisors (82215).

80491993 is an equidigital number, since it uses as much as digits as its factorization.

80491993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82214.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 80491993 is about 8971.7329987021. The cubic root of 80491993 is about 431.7684390723.

The spelling of 80491993 in words is "eighty million, four hundred ninety-one thousand, nine hundred ninety-three".