205401263 has 2 divisors, whose sum is σ = 205401264. Its totient is φ = 205401262.

The previous prime is 205401221. The next prime is 205401271. The reversal of 205401263 is 362104502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205401263 - 2⁶ = 205401199 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205401563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102700631 + 102700632.

It is an arithmetic number, because the mean of its divisors is an integer number (102700632).

Almost surely, 2^205401263 is an apocalyptic number.

205401263 is a deficient number, since it is larger than the sum of its proper divisors (1).

205401263 is an equidigital number, since it uses as much as digits as its factorization.

205401263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 205401263 is about 14331.8269247155. The cubic root of 205401263 is about 590.0213178164.

Adding to 205401263 its reverse (362104502), we get a palindrome (567505765).

The spelling of 205401263 in words is "two hundred five million, four hundred one thousand, two hundred sixty-three".