138470791 has 2 divisors, whose sum is σ = 138470792. Its totient is φ = 138470790.

The previous prime is 138470779. The next prime is 138470807. The reversal of 138470791 is 197074831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138470791 - 2⁷ = 138470663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138470711) 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 as a sum of consecutive naturals, namely, 69235395 + 69235396.

It is an arithmetic number, because the mean of its divisors is an integer number (69235396).

Almost surely, 2^138470791 is an apocalyptic number.

138470791 is a deficient number, since it is larger than the sum of its proper divisors (1).

138470791 is an equidigital number, since it uses as much as digits as its factorization.

138470791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 138470791 is about 11767.3612590079. The cubic root of 138470791 is about 517.3519110755.

The spelling of 138470791 in words is "one hundred thirty-eight million, four hundred seventy thousand, seven hundred ninety-one".