80786921 has 4 divisors (see below), whose sum is σ = 80817792. Its totient is φ = 80756052.

The previous prime is 80786911. The next prime is 80786929. The reversal of 80786921 is 12968708.

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 not a de Polignac number, because 80786921 - 2⁶ = 80786857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80786929) 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, 11105 + ... + 16878.

It is an arithmetic number, because the mean of its divisors is an integer number (20204448).

Almost surely, 2^80786921 is an apocalyptic number.

It is an amenable number.

80786921 is a deficient number, since it is larger than the sum of its proper divisors (30871).

80786921 is a wasteful number, since it uses less digits than its factorization.

80786921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30870.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 80786921 is about 8988.1544824285. The cubic root of 80786921 is about 432.2951390381.

The spelling of 80786921 in words is "eighty million, seven hundred eighty-six thousand, nine hundred twenty-one".