8154854221 has 4 divisors (see below), whose sum is σ = 8155457244. Its totient is φ = 8154251200.

The previous prime is 8154854189. The next prime is 8154854243. The reversal of 8154854221 is 1224584518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1180266025 + 6974588196 = 34355^2 + 83514^2 .

It is a cyclic number.

It is not a de Polignac number, because 8154854221 - 2⁵ = 8154854189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8154854261) 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, 280750 + ... + 308431.

It is an arithmetic number, because the mean of its divisors is an integer number (2038864311).

Almost surely, 2^8154854221 is an apocalyptic number.

It is an amenable number.

8154854221 is a deficient number, since it is larger than the sum of its proper divisors (603023).

8154854221 is a wasteful number, since it uses less digits than its factorization.

8154854221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603022.

The product of its digits is 102400, while the sum is 40.

The square root of 8154854221 is about 90304.2314678554. The cubic root of 8154854221 is about 2012.8221391198.

The spelling of 8154854221 in words is "eight billion, one hundred fifty-four million, eight hundred fifty-four thousand, two hundred twenty-one".