138649091149 has 4 divisors (see below), whose sum is σ = 138650850400. Its totient is φ = 138647331900.

The previous prime is 138649091117. The next prime is 138649091159. The reversal of 138649091149 is 941190946831.

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 not a de Polignac number, because 138649091149 - 2⁵ = 138649091117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138649091149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138649091159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755577 + ... + 920974.

It is an arithmetic number, because the mean of its divisors is an integer number (34662712600).

Almost surely, 2^138649091149 is an apocalyptic number.

It is an amenable number.

138649091149 is a deficient number, since it is larger than the sum of its proper divisors (1759251).

138649091149 is an equidigital number, since it uses as much as digits as its factorization.

138649091149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759250.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 138649091149 in words is "one hundred thirty-eight billion, six hundred forty-nine million, ninety-one thousand, one hundred forty-nine".