138351931249 has 12 divisors (see below), whose sum is σ = 170407061604. Its totient is φ = 111611641344.

The previous prime is 138351931231. The next prime is 138351931253. The reversal of 138351931249 is 942139153831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46061744400 + 92290186849 = 214620^2 + 303793^2 .

It is not a de Polignac number, because 138351931249 - 2¹³ = 138351923057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138351931259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83043544 + ... + 83045209.

It is an arithmetic number, because the mean of its divisors is an integer number (14200588467).

Almost surely, 2^138351931249 is an apocalyptic number.

It is an amenable number.

138351931249 is a deficient number, since it is larger than the sum of its proper divisors (32055130355).

138351931249 is a wasteful number, since it uses less digits than its factorization.

138351931249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166088784 (or 166088777 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The spelling of 138351931249 in words is "one hundred thirty-eight billion, three hundred fifty-one million, nine hundred thirty-one thousand, two hundred forty-nine".