138321725249 has 8 divisors (see below), whose sum is σ = 138550453992. Its totient is φ = 138093056640.

The previous prime is 138321725203. The next prime is 138321725291. The reversal of 138321725249 is 942527123831.

It can be written as a sum of positive squares in 4 ways, for example, as 368908849 + 137952816400 = 19207^2 + 371420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138321725249 - 2²⁸ = 138053289793 is a prime.

It is a super-2 number, since 2×138321725249² (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 (138321625249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7971587 + ... + 7988919.

It is an arithmetic number, because the mean of its divisors is an integer number (17318806749).

Almost surely, 2^138321725249 is an apocalyptic number.

It is an amenable number.

138321725249 is a deficient number, since it is larger than the sum of its proper divisors (228728743).

138321725249 is a wasteful number, since it uses less digits than its factorization.

138321725249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30067.

The product of its digits is 725760, while the sum is 47.

The spelling of 138321725249 in words is "one hundred thirty-eight billion, three hundred twenty-one million, seven hundred twenty-five thousand, two hundred forty-nine".