263320361 has 4 divisors (see below), whose sum is σ = 278809812. Its totient is φ = 247830912.

The previous prime is 263320357. The next prime is 263320381. The reversal of 263320361 is 163023362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163023362 = 2 ⋅81511681.

It can be written as a sum of positive squares in 2 ways, for example, as 172003225 + 91317136 = 13115^2 + 9556^2 .

It is a cyclic number.

It is not a de Polignac number, because 263320361 - 2² = 263320357 is a prime.

It is a super-2 number, since 2×263320361² = 138675225034340642, which contains 22 as substring.

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 263320361.

It is not an unprimeable number, because it can be changed into a prime (263320381) 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, 7744700 + ... + 7744733.

It is an arithmetic number, because the mean of its divisors is an integer number (69702453).

Almost surely, 2^263320361 is an apocalyptic number.

It is an amenable number.

263320361 is a deficient number, since it is larger than the sum of its proper divisors (15489451).

263320361 is a wasteful number, since it uses less digits than its factorization.

263320361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15489450.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 263320361 is about 16227.1488869733. The cubic root of 263320361 is about 640.9558966056.

The spelling of 263320361 in words is "two hundred sixty-three million, three hundred twenty thousand, three hundred sixty-one".