138018719187149 has 4 divisors (see below), whose sum is σ = 138019440204636. Its totient is φ = 138017998169664.

The previous prime is 138018719187137. The next prime is 138018719187161. The reversal of 138018719187149 is 941781917810831.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (138018719187137) and next prime (138018719187161).

It can be written as a sum of positive squares in 2 ways, for example, as 99109630765924 + 38909088421225 = 9955382^2 + 6237715^2 .

It is a cyclic number.

It is not a de Polignac number, because 138018719187149 - 2²⁰ = 138018718138573 is a prime.

It is a super-2 number, since 2×138018719187149² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138018719187949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360221534 + ... + 360604479.

It is an arithmetic number, because the mean of its divisors is an integer number (34504860051159).

Almost surely, 2^{138018719187149} is an apocalyptic number.

It is an amenable number.

138018719187149 is a deficient number, since it is larger than the sum of its proper divisors (721017487).

138018719187149 is an equidigital number, since it uses as much as digits as its factorization.

138018719187149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721017486.

The product of its (nonzero) digits is 24385536, while the sum is 68.

The spelling of 138018719187149 in words is "one hundred thirty-eight trillion, eighteen billion, seven hundred nineteen million, one hundred eighty-seven thousand, one hundred forty-nine".