201005689 has 2 divisors, whose sum is σ = 201005690. Its totient is φ = 201005688.

The previous prime is 201005659. The next prime is 201005713. The reversal of 201005689 is 986500102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156450064 + 44555625 = 12508^2 + 6675^2 .

It is a cyclic number.

It is not a de Polignac number, because 201005689 - 2¹⁵ = 200972921 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201005689.

It is not a weakly prime, because it can be changed into another prime (201005639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100502844 + 100502845.

It is an arithmetic number, because the mean of its divisors is an integer number (100502845).

Almost surely, 2^201005689 is an apocalyptic number.

It is an amenable number.

201005689 is a deficient number, since it is larger than the sum of its proper divisors (1).

201005689 is an equidigital number, since it uses as much as digits as its factorization.

201005689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 201005689 is about 14177.6475128986. The cubic root of 201005689 is about 585.7821267189.

The spelling of 201005689 in words is "two hundred one million, five thousand, six hundred eighty-nine".