220843081 has 4 divisors (see below), whose sum is σ = 221015700. Its totient is φ = 220670464.

The previous prime is 220843069. The next prime is 220843093. The reversal of 220843081 is 180348022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180348022 = 2 ⋅90174011.

It is an interprime number because it is at equal distance from previous prime (220843069) and next prime (220843093).

It can be written as a sum of positive squares in 2 ways, for example, as 150283081 + 70560000 = 12259^2 + 8400^2 .

It is a cyclic number.

It is not a de Polignac number, because 220843081 - 2¹⁵ = 220810313 is a prime.

It is a super-2 number, since 2×220843081² = 97543332851145122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220849081) 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 3 ways as a sum of consecutive naturals, for example, 84376 + ... + 86953.

It is an arithmetic number, because the mean of its divisors is an integer number (55253925).

Almost surely, 2^220843081 is an apocalyptic number.

It is an amenable number.

220843081 is a deficient number, since it is larger than the sum of its proper divisors (172619).

220843081 is a wasteful number, since it uses less digits than its factorization.

220843081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172618.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 220843081 is about 14860.7900530221. The cubic root of 220843081 is about 604.4512301811.

The spelling of 220843081 in words is "two hundred twenty million, eight hundred forty-three thousand, eighty-one".