8913921 has 4 divisors (see below), whose sum is σ = 11885232. Its totient is φ = 5942612.

The previous prime is 8913917. The next prime is 8913923. The reversal of 8913921 is 1293198.

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 8913921 - 2² = 8913917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8913923) 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, 1485651 + ... + 1485656.

It is an arithmetic number, because the mean of its divisors is an integer number (2971308).

Almost surely, 2^8913921 is an apocalyptic number.

It is an amenable number.

8913921 is a deficient number, since it is larger than the sum of its proper divisors (2971311).

8913921 is a wasteful number, since it uses less digits than its factorization.

8913921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971310.

The product of its digits is 3888, while the sum is 33.

The square root of 8913921 is about 2985.6190312898. The cubic root of 8913921 is about 207.3431029562.

The spelling of 8913921 in words is "eight million, nine hundred thirteen thousand, nine hundred twenty-one".