220869181 has 4 divisors (see below), whose sum is σ = 237859132. Its totient is φ = 203879232.

The previous prime is 220869139. The next prime is 220869197. The reversal of 220869181 is 181968022.

220869181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181968022 = 2 ⋅90984011.

It can be written as a sum of positive squares in 2 ways, for example, as 15405625 + 205463556 = 3925^2 + 14334^2 .

It is a cyclic number.

It is not a de Polignac number, because 220869181 - 2¹¹ = 220867133 is a prime.

It is a super-2 number, since 2×220869181² = 97566390231221522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220869181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220869101) 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, 8494956 + ... + 8494981.

It is an arithmetic number, because the mean of its divisors is an integer number (59464783).

Almost surely, 2^220869181 is an apocalyptic number.

It is an amenable number.

220869181 is a deficient number, since it is larger than the sum of its proper divisors (16989951).

220869181 is a wasteful number, since it uses less digits than its factorization.

220869181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16989950.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 220869181 is about 14861.6681768905. The cubic root of 220869181 is about 604.4750412895.

The spelling of 220869181 in words is "two hundred twenty million, eight hundred sixty-nine thousand, one hundred eighty-one".