263443261 has 4 divisors (see below), whose sum is σ = 264604032. Its totient is φ = 262282492.

The previous prime is 263443223. The next prime is 263443273. The reversal of 263443261 is 162344362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263443261 - 2⁷ = 263443133 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263443361) 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 3 ways as a sum of consecutive naturals, for example, 580045 + ... + 580498.

It is an arithmetic number, because the mean of its divisors is an integer number (66151008).

Almost surely, 2^263443261 is an apocalyptic number.

It is an amenable number.

263443261 is a deficient number, since it is larger than the sum of its proper divisors (1160771).

263443261 is a wasteful number, since it uses less digits than its factorization.

263443261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160770.

The product of its digits is 20736, while the sum is 31.

The square root of 263443261 is about 16230.9353088477. The cubic root of 263443261 is about 641.0555992735.

The spelling of 263443261 in words is "two hundred sixty-three million, four hundred forty-three thousand, two hundred sixty-one".