8615921 has 4 divisors (see below), whose sum is σ = 8737344. Its totient is φ = 8494500.

The previous prime is 8615917. The next prime is 8615941. The reversal of 8615921 is 1295168.

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 8615921 - 2² = 8615917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8615941) 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, 60605 + ... + 60746.

It is an arithmetic number, because the mean of its divisors is an integer number (2184336).

Almost surely, 2^8615921 is an apocalyptic number.

It is an amenable number.

8615921 is a deficient number, since it is larger than the sum of its proper divisors (121423).

8615921 is a wasteful number, since it uses less digits than its factorization.

8615921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121422.

The product of its digits is 4320, while the sum is 32.

The square root of 8615921 is about 2935.2889125263. The cubic root of 8615921 is about 205.0063135077.

The spelling of 8615921 in words is "eight million, six hundred fifteen thousand, nine hundred twenty-one".