263476561 has 4 divisors (see below), whose sum is σ = 263706624. Its totient is φ = 263246500.

The previous prime is 263476531. The next prime is 263476589. The reversal of 263476561 is 165674362.

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 263476561 - 2⁵ = 263476529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263476531) 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, 113305 + ... + 115606.

It is an arithmetic number, because the mean of its divisors is an integer number (65926656).

Almost surely, 2^263476561 is an apocalyptic number.

It is an amenable number.

263476561 is a deficient number, since it is larger than the sum of its proper divisors (230063).

263476561 is a wasteful number, since it uses less digits than its factorization.

263476561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230062.

The product of its digits is 181440, while the sum is 40.

The square root of 263476561 is about 16231.9610953206. The cubic root of 263476561 is about 641.0826085708.

The spelling of 263476561 in words is "two hundred sixty-three million, four hundred seventy-six thousand, five hundred sixty-one".