263278081 has 4 divisors (see below), whose sum is σ = 287212464. Its totient is φ = 239343700.

The previous prime is 263278073. The next prime is 263278087. The reversal of 263278081 is 180872362.

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 263278081 - 2³ = 263278073 is a prime.

It is a super-2 number, since 2×263278081² = 138630695870085122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263278081.

It is not an unprimeable number, because it can be changed into a prime (263278087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11967175 + ... + 11967196.

It is an arithmetic number, because the mean of its divisors is an integer number (71803116).

Almost surely, 2^263278081 is an apocalyptic number.

It is an amenable number.

263278081 is a deficient number, since it is larger than the sum of its proper divisors (23934383).

263278081 is a wasteful number, since it uses less digits than its factorization.

263278081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23934382.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 263278081 is about 16225.8460796348. The cubic root of 263278081 is about 640.9215897689.

The spelling of 263278081 in words is "two hundred sixty-three million, two hundred seventy-eight thousand, eighty-one".