138316304281 has 27 divisors (see below), whose sum is σ = 148953238207. Its totient is φ = 128412739520.

The previous prime is 138316304237. The next prime is 138316304299. The reversal of 138316304281 is 182403613831.

The square root of 138316304281 is 371909.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 107685704025 + 30630600256 = 328155^2 + 175016^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138316304281 is a prime.

It is a super-2 number, since 2×138316304281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138316304221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 828241260 + ... + 828241426.

Almost surely, 2^138316304281 is an apocalyptic number.

138316304281 is the 371909-th square number.

138316304281 is the 185955-th centered octagonal number.

It is an amenable number.

138316304281 is a deficient number, since it is larger than the sum of its proper divisors (10636933926).

138316304281 is an frugal number, since it uses more digits than its factorization.

138316304281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 138316304281 in words is "one hundred thirty-eight billion, three hundred sixteen million, three hundred four thousand, two hundred eighty-one".