8169921 has 12 divisors (see below), whose sum is σ = 11826048. Its totient is φ = 5435064.

The previous prime is 8169919. The next prime is 8169923. The reversal of 8169921 is 1299618.

8169921 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8169919) and next prime (8169923).

It is not a de Polignac number, because 8169921 - 2¹ = 8169919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8169923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6856 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (985504).

Almost surely, 2^8169921 is an apocalyptic number.

It is an amenable number.

8169921 is a deficient number, since it is larger than the sum of its proper divisors (3656127).

8169921 is a wasteful number, since it uses less digits than its factorization.

8169921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1929 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 8169921 is about 2858.3073662572. The cubic root of 8169921 is about 201.4060995863.

The spelling of 8169921 in words is "eight million, one hundred sixty-nine thousand, nine hundred twenty-one".