205013111 has 2 divisors, whose sum is σ = 205013112. Its totient is φ = 205013110.

The previous prime is 205013101. The next prime is 205013113. The reversal of 205013111 is 111310502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205013111 - 2¹⁸ = 204750967 is a prime.

Together with 205013113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205013113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102506555 + 102506556.

It is an arithmetic number, because the mean of its divisors is an integer number (102506556).

Almost surely, 2^205013111 is an apocalyptic number.

205013111 is a deficient number, since it is larger than the sum of its proper divisors (1).

205013111 is an equidigital number, since it uses as much as digits as its factorization.

205013111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 205013111 is about 14318.2789119363. The cubic root of 205013111 is about 589.6494240198.

Adding to 205013111 its reverse (111310502), we get a palindrome (316323613).

The spelling of 205013111 in words is "two hundred five million, thirteen thousand, one hundred eleven".