138036281 has 4 divisors (see below), whose sum is σ = 140096592. Its totient is φ = 135975972.

The previous prime is 138036263. The next prime is 138036319. The reversal of 138036281 is 182630831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138036281 is a prime.

It is a super-2 number, since 2×138036281² = 38108029744621922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138036251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030055 + ... + 1030188.

It is an arithmetic number, because the mean of its divisors is an integer number (35024148).

Almost surely, 2^138036281 is an apocalyptic number.

It is an amenable number.

138036281 is a deficient number, since it is larger than the sum of its proper divisors (2060311).

138036281 is an equidigital number, since it uses as much as digits as its factorization.

138036281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060310.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 138036281 is about 11748.8842448975. The cubic root of 138036281 is about 516.8102080997.

The spelling of 138036281 in words is "one hundred thirty-eight million, thirty-six thousand, two hundred eighty-one".