205411601 has 2 divisors, whose sum is σ = 205411602. Its totient is φ = 205411600.

The previous prime is 205411589. The next prime is 205411621. The reversal of 205411601 is 106114502.

It is an a-pointer prime, because the next prime (205411621) can be obtained adding 205411601 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189090001 + 16321600 = 13751^2 + 4040^2 .

It is a cyclic number.

It is not a de Polignac number, because 205411601 - 2²² = 201217297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205411621) 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 as a sum of consecutive naturals, namely, 102705800 + 102705801.

It is an arithmetic number, because the mean of its divisors is an integer number (102705801).

Almost surely, 2^205411601 is an apocalyptic number.

It is an amenable number.

205411601 is a deficient number, since it is larger than the sum of its proper divisors (1).

205411601 is an equidigital number, since it uses as much as digits as its factorization.

205411601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 205411601 is about 14332.1875859898. The cubic root of 205411601 is about 590.0312163891.

The spelling of 205411601 in words is "two hundred five million, four hundred eleven thousand, six hundred one".