8554831221 has 4 divisors (see below), whose sum is σ = 11406441632. Its totient is φ = 5703220812.

The previous prime is 8554831157. The next prime is 8554831303. The reversal of 8554831221 is 1221384558.

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 not a de Polignac number, because 8554831221 - 2⁶ = 8554831157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8554831221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8554831321) 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, 1425805201 + ... + 1425805206.

It is an arithmetic number, because the mean of its divisors is an integer number (2851610408).

Almost surely, 2^8554831221 is an apocalyptic number.

It is an amenable number.

8554831221 is a deficient number, since it is larger than the sum of its proper divisors (2851610411).

8554831221 is a wasteful number, since it uses less digits than its factorization.

8554831221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851610410.

The product of its digits is 76800, while the sum is 39.

The square root of 8554831221 is about 92492.3306063805. The cubic root of 8554831221 is about 2045.2064258797.

The spelling of 8554831221 in words is "eight billion, five hundred fifty-four million, eight hundred thirty-one thousand, two hundred twenty-one".