205031011 has 2 divisors, whose sum is σ = 205031012. Its totient is φ = 205031010.

The previous prime is 205030997. The next prime is 205031053. The reversal of 205031011 is 110130502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205031011 - 2⁹ = 205030499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205030982 and 205031000.

It is not a weakly prime, because it can be changed into another prime (205031311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102515505 + 102515506.

It is an arithmetic number, because the mean of its divisors is an integer number (102515506).

Almost surely, 2^205031011 is an apocalyptic number.

205031011 is a deficient number, since it is larger than the sum of its proper divisors (1).

205031011 is an equidigital number, since it uses as much as digits as its factorization.

205031011 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 13.

The square root of 205031011 is about 14318.9039734192. The cubic root of 205031011 is about 589.6665845768. Note that the first 3 decimals are identical.

Adding to 205031011 its reverse (110130502), we get a palindrome (315161513).

The spelling of 205031011 in words is "two hundred five million, thirty-one thousand, eleven".