263561423 has 4 divisors (see below), whose sum is σ = 263727648. Its totient is φ = 263395200.

The previous prime is 263561413. The next prime is 263561453. The reversal of 263561423 is 324165362.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 263561423 - 2⁸ = 263561167 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 263561423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263561413) 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 in 3 ways as a sum of consecutive naturals, for example, 80711 + ... + 83912.

It is an arithmetic number, because the mean of its divisors is an integer number (65931912).

Almost surely, 2^263561423 is an apocalyptic number.

263561423 is a deficient number, since it is larger than the sum of its proper divisors (166225).

263561423 is a wasteful number, since it uses less digits than its factorization.

263561423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166224.

The product of its digits is 25920, while the sum is 32.

The square root of 263561423 is about 16234.5749251405. The cubic root of 263561423 is about 641.1514290031.

The spelling of 263561423 in words is "two hundred sixty-three million, five hundred sixty-one thousand, four hundred twenty-three".