138391601 has 2 divisors, whose sum is σ = 138391602. Its totient is φ = 138391600.

The previous prime is 138391571. The next prime is 138391633. The reversal of 138391601 is 106193831.

It is an a-pointer prime, because the next prime (138391633) can be obtained adding 138391601 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137827600 + 564001 = 11740^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 138391601 - 2⁶ = 138391537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138391661) 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, 69195800 + 69195801.

It is an arithmetic number, because the mean of its divisors is an integer number (69195801).

Almost surely, 2^138391601 is an apocalyptic number.

It is an amenable number.

138391601 is a deficient number, since it is larger than the sum of its proper divisors (1).

138391601 is an equidigital number, since it uses as much as digits as its factorization.

138391601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 138391601 is about 11763.9959622570. The cubic root of 138391601 is about 517.2532695499.

The spelling of 138391601 in words is "one hundred thirty-eight million, three hundred ninety-one thousand, six hundred one".