80996491 has 4 divisors (see below), whose sum is σ = 81042192. Its totient is φ = 80950792.

The previous prime is 80996473. The next prime is 80996527. The reversal of 80996491 is 19469908.

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 80996491 - 2⁹ = 80995979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80996431) 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, 20080 + ... + 23773.

It is an arithmetic number, because the mean of its divisors is an integer number (20260548).

Almost surely, 2^80996491 is an apocalyptic number.

80996491 is a deficient number, since it is larger than the sum of its proper divisors (45701).

80996491 is a wasteful number, since it uses less digits than its factorization.

80996491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45700.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 80996491 is about 8999.8050534442. The cubic root of 80996491 is about 432.6686230344.

The spelling of 80996491 in words is "eighty million, nine hundred ninety-six thousand, four hundred ninety-one".