80195821 has 4 divisors (see below), whose sum is σ = 80269632. Its totient is φ = 80122012.

The previous prime is 80195813. The next prime is 80195833. The reversal of 80195821 is 12859108.

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 80195821 - 2³ = 80195813 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 (80195881) 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, 35251 + ... + 37456.

It is an arithmetic number, because the mean of its divisors is an integer number (20067408).

Almost surely, 2^80195821 is an apocalyptic number.

It is an amenable number.

80195821 is a deficient number, since it is larger than the sum of its proper divisors (73811).

80195821 is a wasteful number, since it uses less digits than its factorization.

80195821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73810.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 80195821 is about 8955.2119461239. The cubic root of 80195821 is about 431.2382211724.

The spelling of 80195821 in words is "eighty million, one hundred ninety-five thousand, eight hundred twenty-one".