205066981 has 16 divisors (see below), whose sum is σ = 247811200. Its totient is φ = 165768768.

The previous prime is 205066973. The next prime is 205067029. The reversal of 205066981 is 189660502.

It is not a de Polignac number, because 205066981 - 2³ = 205066973 is a prime.

It is a super-2 number, since 2×205066981² = 84104933392908722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205066981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205066951) 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 15 ways as a sum of consecutive naturals, for example, 27091 + ... + 33823.

It is an arithmetic number, because the mean of its divisors is an integer number (15488200).

Almost surely, 2^205066981 is an apocalyptic number.

It is an amenable number.

205066981 is a deficient number, since it is larger than the sum of its proper divisors (42744219).

205066981 is a wasteful number, since it uses less digits than its factorization.

205066981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 205066981 is about 14320.1599502240. The cubic root of 205066981 is about 589.7010656482.

It can be divided in two parts, 20 and 5066981, that added together give a square (5067001 = 2251²).

The spelling of 205066981 in words is "two hundred five million, sixty-six thousand, nine hundred eighty-one".