138043751 has 2 divisors, whose sum is σ = 138043752. Its totient is φ = 138043750.

The previous prime is 138043733. The next prime is 138043753. The reversal of 138043751 is 157340831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138043751 - 2⁶ = 138043687 is a prime.

Together with 138043753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138043753) 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 as a sum of consecutive naturals, namely, 69021875 + 69021876.

It is an arithmetic number, because the mean of its divisors is an integer number (69021876).

Almost surely, 2^138043751 is an apocalyptic number.

138043751 is a deficient number, since it is larger than the sum of its proper divisors (1).

138043751 is an equidigital number, since it uses as much as digits as its factorization.

138043751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 138043751 is about 11749.2021431244. The cubic root of 138043751 is about 516.8195305344.

The spelling of 138043751 in words is "one hundred thirty-eight million, forty-three thousand, seven hundred fifty-one".