138621791241 has 48 divisors (see below), whose sum is σ = 208556974912. Its totient is φ = 88653398400.

The previous prime is 138621791227. The next prime is 138621791249. The reversal of 138621791241 is 142197126831.

138621791241 is a `hidden beast` number, since 1 + 3 + 8 + 621 + 7 + 9 + 12 + 4 + 1 = 666.

It is not a de Polignac number, because 138621791241 - 2²¹ = 138619694089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138621791249) 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 47 ways as a sum of consecutive naturals, for example, 17299926 + ... + 17307936.

Almost surely, 2^138621791241 is an apocalyptic number.

It is an amenable number.

138621791241 is a deficient number, since it is larger than the sum of its proper divisors (69935183671).

138621791241 is a wasteful number, since it uses less digits than its factorization.

138621791241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8854 (or 8851 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 138621791241 in words is "one hundred thirty-eight billion, six hundred twenty-one million, seven hundred ninety-one thousand, two hundred forty-one".