263105261 has 16 divisors (see below), whose sum is σ = 281136768. Its totient is φ = 245851200.

The previous prime is 263105239. The next prime is 263105267. The reversal of 263105261 is 162501362.

It is a cyclic number.

It is not a de Polignac number, because 263105261 - 2²⁶ = 195996397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263105261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263105267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95696 + ... + 98406.

It is an arithmetic number, because the mean of its divisors is an integer number (17571048).

Almost surely, 2^263105261 is an apocalyptic number.

It is an amenable number.

263105261 is a deficient number, since it is larger than the sum of its proper divisors (18031507).

263105261 is a wasteful number, since it uses less digits than its factorization.

263105261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2852.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 263105261 is about 16220.5197512287. The cubic root of 263105261 is about 640.7813219662.

The spelling of 263105261 in words is "two hundred sixty-three million, one hundred five thousand, two hundred sixty-one".