8945221891 has 8 divisors (see below), whose sum is σ = 9476485920. Its totient is φ = 8414521728.

The previous prime is 8945221877. The next prime is 8945221919. The reversal of 8945221891 is 1981225498.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8945221891 - 2⁹ = 8945221379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8945221871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108076 + ... + 171961.

It is an arithmetic number, because the mean of its divisors is an integer number (1184560740).

Almost surely, 2^8945221891 is an apocalyptic number.

8945221891 is a deficient number, since it is larger than the sum of its proper divisors (531264029).

8945221891 is a wasteful number, since it uses less digits than its factorization.

8945221891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281933.

The product of its digits is 414720, while the sum is 49.

The square root of 8945221891 is about 94579.1831800212. The cubic root of 8945221891 is about 2075.8551188642.

The spelling of 8945221891 in words is "eight billion, nine hundred forty-five million, two hundred twenty-one thousand, eight hundred ninety-one".