138711751 has 4 divisors (see below), whose sum is σ = 140270400. Its totient is φ = 137153104.

The previous prime is 138711739. The next prime is 138711757. The reversal of 138711751 is 157117831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157117831 = 13 ⋅12085987.

It is a cyclic number.

It is not a de Polignac number, because 138711751 - 2⁵ = 138711719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138711757) 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 3 ways as a sum of consecutive naturals, for example, 779191 + ... + 779368.

It is an arithmetic number, because the mean of its divisors is an integer number (35067600).

Almost surely, 2^138711751 is an apocalyptic number.

138711751 is a deficient number, since it is larger than the sum of its proper divisors (1558649).

138711751 is an equidigital number, since it uses as much as digits as its factorization.

138711751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558648.

The product of its digits is 5880, while the sum is 34.

The square root of 138711751 is about 11777.5952978526. The cubic root of 138711751 is about 517.6518272184.

The spelling of 138711751 in words is "one hundred thirty-eight million, seven hundred eleven thousand, seven hundred fifty-one".