80845517 has 4 divisors (see below), whose sum is σ = 82215840. Its totient is φ = 79475196.

The previous prime is 80845507. The next prime is 80845537. The reversal of 80845517 is 71554808.

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 80845517 - 2¹⁰ = 80844493 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 (80845507) 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, 685073 + ... + 685190.

It is an arithmetic number, because the mean of its divisors is an integer number (20553960).

Almost surely, 2^80845517 is an apocalyptic number.

It is an amenable number.

80845517 is a deficient number, since it is larger than the sum of its proper divisors (1370323).

80845517 is a wasteful number, since it uses less digits than its factorization.

80845517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370322.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 80845517 is about 8991.4135151265. The cubic root of 80845517 is about 432.3996305567.

The spelling of 80845517 in words is "eighty million, eight hundred forty-five thousand, five hundred seventeen".