205542011 has 2 divisors, whose sum is σ = 205542012. Its totient is φ = 205542010.

The previous prime is 205541989. The next prime is 205542031. The reversal of 205542011 is 110245502.

It is an a-pointer prime, because the next prime (205542031) can be obtained adding 205542011 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205542011 - 2¹⁴ = 205525627 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (205542031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102771005 + 102771006.

It is an arithmetic number, because the mean of its divisors is an integer number (102771006).

Almost surely, 2^205542011 is an apocalyptic number.

205542011 is a deficient number, since it is larger than the sum of its proper divisors (1).

205542011 is an equidigital number, since it uses as much as digits as its factorization.

205542011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205542011 is about 14336.7364138426. The cubic root of 205542011 is about 590.1560546694.

Adding to 205542011 its reverse (110245502), we get a palindrome (315787513).

The spelling of 205542011 in words is "two hundred five million, five hundred forty-two thousand, eleven".