263528261 has 2 divisors, whose sum is σ = 263528262. Its totient is φ = 263528260.

The previous prime is 263528257. The next prime is 263528297. The reversal of 263528261 is 162825362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 70040161 = 13910^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 263528261 - 2² = 263528257 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 (263528761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131764130 + 131764131.

It is an arithmetic number, because the mean of its divisors is an integer number (131764131).

Almost surely, 2^263528261 is an apocalyptic number.

It is an amenable number.

263528261 is a deficient number, since it is larger than the sum of its proper divisors (1).

263528261 is an equidigital number, since it uses as much as digits as its factorization.

263528261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 263528261 is about 16233.5535542900. The cubic root of 263528261 is about 641.1245374153.

The spelling of 263528261 in words is "two hundred sixty-three million, five hundred twenty-eight thousand, two hundred sixty-one".