263561873 has 4 divisors (see below), whose sum is σ = 263622948. Its totient is φ = 263500800.

The previous prime is 263561861. The next prime is 263561887. The reversal of 263561873 is 378165362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378165362 = 2 ⋅189082681.

It can be written as a sum of positive squares in 2 ways, for example, as 218093824 + 45468049 = 14768^2 + 6743^2 .

It is a cyclic number.

It is not a de Polignac number, because 263561873 - 2¹⁰ = 263560849 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 263561873.

It is not an unprimeable number, because it can be changed into a prime (263561803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23528 + ... + 32873.

It is an arithmetic number, because the mean of its divisors is an integer number (65905737).

Almost surely, 2^263561873 is an apocalyptic number.

It is an amenable number.

263561873 is a deficient number, since it is larger than the sum of its proper divisors (61075).

263561873 is an equidigital number, since it uses as much as digits as its factorization.

263561873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61074.

The product of its digits is 181440, while the sum is 41.

The square root of 263561873 is about 16234.5887844442. The cubic root of 263561873 is about 641.1517938997.

The spelling of 263561873 in words is "two hundred sixty-three million, five hundred sixty-one thousand, eight hundred seventy-three".