138362281 has 2 divisors, whose sum is σ = 138362282. Its totient is φ = 138362280.

The previous prime is 138362251. The next prime is 138362299. The reversal of 138362281 is 182263831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130325056 + 8037225 = 11416^2 + 2835^2 .

It is a cyclic number.

It is not a de Polignac number, because 138362281 - 2⁷ = 138362153 is a prime.

It is a super-2 number, since 2×138362281² = 38288241607045922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138362251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69181140 + 69181141.

It is an arithmetic number, because the mean of its divisors is an integer number (69181141).

Almost surely, 2^138362281 is an apocalyptic number.

It is an amenable number.

138362281 is a deficient number, since it is larger than the sum of its proper divisors (1).

138362281 is an equidigital number, since it uses as much as digits as its factorization.

138362281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 138362281 is about 11762.7497210474. The cubic root of 138362281 is about 517.2167381012.

The spelling of 138362281 in words is "one hundred thirty-eight million, three hundred sixty-two thousand, two hundred eighty-one".