206180881 has 9 divisors (see below), whose sum is σ = 209908219. Its totient is φ = 202519336.

The previous prime is 206180873. The next prime is 206180911. The reversal of 206180881 is 188081602.

The square root of 206180881 is 14359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 187553025 + 18627856 = 13695^2 + 4316^2 .

It is not a de Polignac number, because 206180881 - 2³ = 206180873 is a prime.

It is a super-2 number, since 2×206180881² = 85021111379872322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206180801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1191711 + ... + 1191883.

Almost surely, 2^206180881 is an apocalyptic number.

206180881 is the 14359-th square number.

206180881 is the 7180-th centered octagonal number.

It is an amenable number.

206180881 is a deficient number, since it is larger than the sum of its proper divisors (3727338).

206180881 is an frugal number, since it uses more digits than its factorization.

206180881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The cubic root of 206180881 is about 590.7668674111.

The spelling of 206180881 in words is "two hundred six million, one hundred eighty thousand, eight hundred eighty-one".