8160821 has 4 divisors (see below), whose sum is σ = 8299200. Its totient is φ = 8022444.

The previous prime is 8160773. The next prime is 8160827. The reversal of 8160821 is 1280618.

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 8160821 - 2²² = 3966517 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 (8160827) 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, 69101 + ... + 69218.

It is an arithmetic number, because the mean of its divisors is an integer number (2074800).

Almost surely, 2^8160821 is an apocalyptic number.

It is an amenable number.

8160821 is a deficient number, since it is larger than the sum of its proper divisors (138379).

8160821 is a wasteful number, since it uses less digits than its factorization.

8160821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138378.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 8160821 is about 2856.7150715463. The cubic root of 8160821 is about 201.3312936239.

The spelling of 8160821 in words is "eight million, one hundred sixty thousand, eight hundred twenty-one".