263821913 has 2 divisors, whose sum is σ = 263821914. Its totient is φ = 263821912.

The previous prime is 263821847. The next prime is 263821919. The reversal of 263821913 is 319128362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157051024 + 106770889 = 12532^2 + 10333^2 .

It is a cyclic number.

It is not a de Polignac number, because 263821913 - 2¹⁰ = 263820889 is a prime.

It is not a weakly prime, because it can be changed into another prime (263821919) 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, 131910956 + 131910957.

It is an arithmetic number, because the mean of its divisors is an integer number (131910957).

Almost surely, 2^263821913 is an apocalyptic number.

It is an amenable number.

263821913 is a deficient number, since it is larger than the sum of its proper divisors (1).

263821913 is an equidigital number, since it uses as much as digits as its factorization.

263821913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 263821913 is about 16242.5956361660. The cubic root of 263821913 is about 641.3625860352.

The spelling of 263821913 in words is "two hundred sixty-three million, eight hundred twenty-one thousand, nine hundred thirteen".