268479781 has 2 divisors, whose sum is σ = 268479782. Its totient is φ = 268479780.

The previous prime is 268479779. The next prime is 268479797. The reversal of 268479781 is 187974862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257089156 + 11390625 = 16034^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 268479781 - 2¹ = 268479779 is a prime.

It is a super-2 number, since 2×268479781² = 144162785611615922, which contains 22 as substring.

Together with 268479779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268471781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134239890 + 134239891.

It is an arithmetic number, because the mean of its divisors is an integer number (134239891).

Almost surely, 2^268479781 is an apocalyptic number.

It is an amenable number.

268479781 is a deficient number, since it is larger than the sum of its proper divisors (1).

268479781 is an equidigital number, since it uses as much as digits as its factorization.

268479781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 52.

The square root of 268479781 is about 16385.3526358147. The cubic root of 268479781 is about 645.1150815230.

The spelling of 268479781 in words is "two hundred sixty-eight million, four hundred seventy-nine thousand, seven hundred eighty-one".