268138069 has 2 divisors, whose sum is σ = 268138070. Its totient is φ = 268138068.

The previous prime is 268138049. The next prime is 268138081. The reversal of 268138069 is 960831862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223113969 + 45024100 = 14937^2 + 6710^2 .

It is a cyclic number.

It is not a de Polignac number, because 268138069 - 2²⁵ = 234583637 is a prime.

It is a super-2 number, since 2×268138069² = 143796048094097522, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268138049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134069034 + 134069035.

It is an arithmetic number, because the mean of its divisors is an integer number (134069035).

Almost surely, 2^268138069 is an apocalyptic number.

It is an amenable number.

268138069 is a deficient number, since it is larger than the sum of its proper divisors (1).

268138069 is an equidigital number, since it uses as much as digits as its factorization.

268138069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 268138069 is about 16374.9219540125. The cubic root of 268138069 is about 644.8412717604.

The spelling of 268138069 in words is "two hundred sixty-eight million, one hundred thirty-eight thousand, sixty-nine".