263413681 has 2 divisors, whose sum is σ = 263413682. Its totient is φ = 263413680.

The previous prime is 263413679. The next prime is 263413721. The reversal of 263413681 is 186314362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134931456 + 128482225 = 11616^2 + 11335^2 .

It is a cyclic number.

It is not a de Polignac number, because 263413681 - 2¹ = 263413679 is a prime.

It is a super-2 number, since 2×263413681² = 138773534675939522, which contains 22 as substring.

Together with 263413679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (263413781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131706840 + 131706841.

It is an arithmetic number, because the mean of its divisors is an integer number (131706841).

Almost surely, 2^263413681 is an apocalyptic number.

It is an amenable number.

263413681 is a deficient number, since it is larger than the sum of its proper divisors (1).

263413681 is an equidigital number, since it uses as much as digits as its factorization.

263413681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 263413681 is about 16230.0240603642. The cubic root of 263413681 is about 641.0316053221.

The spelling of 263413681 in words is "two hundred sixty-three million, four hundred thirteen thousand, six hundred eighty-one".