263239481 has 2 divisors, whose sum is σ = 263239482. Its totient is φ = 263239480.

The previous prime is 263239463. The next prime is 263239519. The reversal of 263239481 is 184932362.

It is an a-pointer prime, because the next prime (263239519) can be obtained adding 263239481 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171845881 + 91393600 = 13109^2 + 9560^2 .

It is a cyclic number.

It is not a de Polignac number, because 263239481 - 2²⁶ = 196130617 is a prime.

It is a super-2 number, since 2×263239481² = 138590048714298722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263239381) 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 as a sum of consecutive naturals, namely, 131619740 + 131619741.

It is an arithmetic number, because the mean of its divisors is an integer number (131619741).

Almost surely, 2^263239481 is an apocalyptic number.

It is an amenable number.

263239481 is a deficient number, since it is larger than the sum of its proper divisors (1).

263239481 is an equidigital number, since it uses as much as digits as its factorization.

263239481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 38.

The square root of 263239481 is about 16224.6565757183. The cubic root of 263239481 is about 640.8902657504.

The spelling of 263239481 in words is "two hundred sixty-three million, two hundred thirty-nine thousand, four hundred eighty-one".