138601649 has 2 divisors, whose sum is σ = 138601650. Its totient is φ = 138601648.

The previous prime is 138601601. The next prime is 138601717. The reversal of 138601649 is 946106831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86862400 + 51739249 = 9320^2 + 7193^2 .

It is a cyclic number.

It is not a de Polignac number, because 138601649 - 2²⁴ = 121824433 is a prime.

It is equal to p_7837526 and since 138601649 and 7837526 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138601049) 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, 69300824 + 69300825.

It is an arithmetic number, because the mean of its divisors is an integer number (69300825).

Almost surely, 2^138601649 is an apocalyptic number.

It is an amenable number.

138601649 is a deficient number, since it is larger than the sum of its proper divisors (1).

138601649 is an equidigital number, since it uses as much as digits as its factorization.

138601649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 138601649 is about 11772.9201560191. The cubic root of 138601649 is about 517.5148294816.

The spelling of 138601649 in words is "one hundred thirty-eight million, six hundred one thousand, six hundred forty-nine".