138717641 has 2 divisors, whose sum is σ = 138717642. Its totient is φ = 138717640.

The previous prime is 138717629. The next prime is 138717647. The reversal of 138717641 is 146717831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132342016 + 6375625 = 11504^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 138717641 - 2¹⁴ = 138701257 is a prime.

It is equal to p_7843691 and since 138717641 and 7843691 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 138717595 and 138717604.

It is not a weakly prime, because it can be changed into another prime (138717647) 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, 69358820 + 69358821.

It is an arithmetic number, because the mean of its divisors is an integer number (69358821).

Almost surely, 2^138717641 is an apocalyptic number.

It is an amenable number.

138717641 is a deficient number, since it is larger than the sum of its proper divisors (1).

138717641 is an equidigital number, since it uses as much as digits as its factorization.

138717641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 138717641 is about 11777.8453462422. The cubic root of 138717641 is about 517.6591539856.

It can be divided in two parts, 13871 and 7641, that added together give a palindrome (21512).

The spelling of 138717641 in words is "one hundred thirty-eight million, seven hundred seventeen thousand, six hundred forty-one".