8111921 has 4 divisors (see below), whose sum is σ = 8118000. Its totient is φ = 8105844.

The previous prime is 8111911. The next prime is 8111923. The reversal of 8111921 is 1291118.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8111921 - 2¹⁰ = 8110897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (8111923) 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, 71 + ... + 4028.

It is an arithmetic number, because the mean of its divisors is an integer number (2029500).

Almost surely, 2^8111921 is an apocalyptic number.

It is an amenable number.

8111921 is a deficient number, since it is larger than the sum of its proper divisors (6079).

8111921 is a wasteful number, since it uses less digits than its factorization.

8111921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6078.

The product of its digits is 144, while the sum is 23.

The square root of 8111921 is about 2848.1434303771. The cubic root of 8111921 is about 200.9283590795.

The spelling of 8111921 in words is "eight million, one hundred eleven thousand, nine hundred twenty-one".