8619079921 has 9 divisors (see below), whose sum is σ = 8676555979. Its totient is φ = 8561983936.

The previous prime is 8619079907. The next prime is 8619079927. The reversal of 8619079921 is 1299709168.

The square root of 8619079921 is 92839.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3501680625 + 5117399296 = 59175^2 + 71536^2 .

It is not a de Polignac number, because 8619079921 - 2¹³ = 8619071729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8619079927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24416481 + ... + 24416833.

Almost surely, 2^8619079921 is an apocalyptic number.

8619079921 is the 92839-th square number.

8619079921 is the 46420-th centered octagonal number.

It is an amenable number.

8619079921 is a deficient number, since it is larger than the sum of its proper divisors (57476058).

8619079921 is an frugal number, since it uses more digits than its factorization.

8619079921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 52.

The cubic root of 8619079921 is about 2050.3136479050.

The spelling of 8619079921 in words is "eight billion, six hundred nineteen million, seventy-nine thousand, nine hundred twenty-one".