138750155 has 4 divisors (see below), whose sum is σ = 166500192. Its totient is φ = 111000120.

The previous prime is 138750137. The next prime is 138750169. The reversal of 138750155 is 551057831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551057831 = 2791 ⋅197441.

It is not a de Polignac number, because 138750155 - 2⁸ = 138749899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13875011 + ... + 13875020.

It is an arithmetic number, because the mean of its divisors is an integer number (41625048).

Almost surely, 2^138750155 is an apocalyptic number.

138750155 is a deficient number, since it is larger than the sum of its proper divisors (27750037).

138750155 is an equidigital number, since it uses as much as digits as its factorization.

138750155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27750036.

The product of its (nonzero) digits is 21000, while the sum is 35.

The square root of 138750155 is about 11779.2255687715. The cubic root of 138750155 is about 517.6995955011.

The spelling of 138750155 in words is "one hundred thirty-eight million, seven hundred fifty thousand, one hundred fifty-five".