268138081 has 2 divisors, whose sum is σ = 268138082. Its totient is φ = 268138080.

The previous prime is 268138069. The next prime is 268138109. The reversal of 268138081 is 180831862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194881600 + 73256481 = 13960^2 + 8559^2 .

It is a cyclic number.

It is not a de Polignac number, because 268138081 - 2⁵ = 268138049 is a prime.

It is a super-2 number, since 2×268138081² = 143796060964725122, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 268138081.

It is not a weakly prime, because it can be changed into another prime (268138681) 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, 134069040 + 134069041.

It is an arithmetic number, because the mean of its divisors is an integer number (134069041).

Almost surely, 2^268138081 is an apocalyptic number.

It is an amenable number.

268138081 is a deficient number, since it is larger than the sum of its proper divisors (1).

268138081 is an equidigital number, since it uses as much as digits as its factorization.

268138081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 268138081 is about 16374.9223204264. The cubic root of 268138081 is about 644.8412813799.

The spelling of 268138081 in words is "two hundred sixty-eight million, one hundred thirty-eight thousand, eighty-one".