268263781 has 2 divisors, whose sum is σ = 268263782. Its totient is φ = 268263780.

The previous prime is 268263763. The next prime is 268263797. The reversal of 268263781 is 187362862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243672100 + 24591681 = 15610^2 + 4959^2 .

It is a cyclic number.

It is not a de Polignac number, because 268263781 - 2¹⁵ = 268231013 is a prime.

It is a super-2 number, since 2×268263781² = 143930912392831922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268263701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134131890 + 134131891.

It is an arithmetic number, because the mean of its divisors is an integer number (134131891).

Almost surely, 2^268263781 is an apocalyptic number.

It is an amenable number.

268263781 is a deficient number, since it is larger than the sum of its proper divisors (1).

268263781 is an equidigital number, since it uses as much as digits as its factorization.

268263781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 268263781 is about 16378.7600568541. The cubic root of 268263781 is about 644.9420303248.

The spelling of 268263781 in words is "two hundred sixty-eight million, two hundred sixty-three thousand, seven hundred eighty-one".