206144261 has 8 divisors (see below), whose sum is σ = 218424024. Its totient is φ = 193881600.

The previous prime is 206144251. The next prime is 206144287. The reversal of 206144261 is 162441602.

It can be written as a sum of positive squares in 4 ways, for example, as 83156161 + 122988100 = 9119^2 + 11090^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-206144261 is a prime.

It is a super-3 number, since 3×206144261³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 206144261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206144201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27251 + ... + 33983.

It is an arithmetic number, because the mean of its divisors is an integer number (27303003).

Almost surely, 2^206144261 is an apocalyptic number.

It is an amenable number.

206144261 is a deficient number, since it is larger than the sum of its proper divisors (12279763).

206144261 is a wasteful number, since it uses less digits than its factorization.

206144261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8551.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 206144261 is about 14357.7247849372. The cubic root of 206144261 is about 590.7318897684.

Adding to 206144261 its reverse (162441602), we get a palindrome (368585863).

The spelling of 206144261 in words is "two hundred six million, one hundred forty-four thousand, two hundred sixty-one".