220545891 has 6 divisors (see below), whose sum is σ = 318566300. Its totient is φ = 147030588.

The previous prime is 220545889. The next prime is 220545931. The reversal of 220545891 is 198545022.

220545891 is a `hidden beast` number, since 2 + 20 + 54 + 589 + 1 = 666.

It is not a de Polignac number, because 220545891 - 2¹ = 220545889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220545881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12252541 + ... + 12252558.

Almost surely, 2^220545891 is an apocalyptic number.

220545891 is a deficient number, since it is larger than the sum of its proper divisors (98020409).

220545891 is a wasteful number, since it uses less digits than its factorization.

220545891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24505105 (or 24505102 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 220545891 is about 14850.7875548740. The cubic root of 220545891 is about 604.1799704551.

The spelling of 220545891 in words is "two hundred twenty million, five hundred forty-five thousand, eight hundred ninety-one".