138774751 has 2 divisors, whose sum is σ = 138774752. Its totient is φ = 138774750.

The previous prime is 138774739. The next prime is 138774761. The reversal of 138774751 is 157477831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138774751 - 2¹³ = 138766559 is a prime.

It is a super-2 number, since 2×138774751² = 38516863030224002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138774698 and 138774707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138774721) 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, 69387375 + 69387376.

It is an arithmetic number, because the mean of its divisors is an integer number (69387376).

Almost surely, 2^138774751 is an apocalyptic number.

138774751 is a deficient number, since it is larger than the sum of its proper divisors (1).

138774751 is an equidigital number, since it uses as much as digits as its factorization.

138774751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 43.

The square root of 138774751 is about 11780.2695639786. The cubic root of 138774751 is about 517.7301842643.

The spelling of 138774751 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, seven hundred fifty-one".