205525511 has 2 divisors, whose sum is σ = 205525512. Its totient is φ = 205525510.

The previous prime is 205525487. The next prime is 205525517. The reversal of 205525511 is 115525502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205525511 - 2¹⁴ = 205509127 is a prime.

It is a super-2 number, since 2×205525511² = 84481471343622242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205525517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102762755 + 102762756.

It is an arithmetic number, because the mean of its divisors is an integer number (102762756).

Almost surely, 2^205525511 is an apocalyptic number.

205525511 is a deficient number, since it is larger than the sum of its proper divisors (1).

205525511 is an equidigital number, since it uses as much as digits as its factorization.

205525511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 205525511 is about 14336.1609575228. The cubic root of 205525511 is about 590.1402625443.

Subtracting from 205525511 its reverse (115525502), we obtain a palindrome (90000009).

The spelling of 205525511 in words is "two hundred five million, five hundred twenty-five thousand, five hundred eleven".