138783641 has 2 divisors, whose sum is σ = 138783642. Its totient is φ = 138783640.

The previous prime is 138783637. The next prime is 138783643. The reversal of 138783641 is 146387831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121110025 + 17673616 = 11005^2 + 4204^2 .

It is a cyclic number.

It is not a de Polignac number, because 138783641 - 2² = 138783637 is a prime.

Together with 138783643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138783643) 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, 69391820 + 69391821.

It is an arithmetic number, because the mean of its divisors is an integer number (69391821).

Almost surely, 2^138783641 is an apocalyptic number.

It is an amenable number.

138783641 is a deficient number, since it is larger than the sum of its proper divisors (1).

138783641 is an equidigital number, since it uses as much as digits as its factorization.

138783641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 138783641 is about 11780.6468837666. The cubic root of 138783641 is about 517.7412394047.

The spelling of 138783641 in words is "one hundred thirty-eight million, seven hundred eighty-three thousand, six hundred forty-one".