138351517 has 8 divisors (see below), whose sum is σ = 140004792. Its totient is φ = 136704000.

The previous prime is 138351487. The next prime is 138351527. The reversal of 138351517 is 715153831.

It can be written as a sum of positive squares in 4 ways, for example, as 48594841 + 89756676 = 6971^2 + 9474^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138351517 is a prime.

It is a super-2 number, since 2×138351517² = 38282284512402578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138351527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63673 + ... + 65809.

It is an arithmetic number, because the mean of its divisors is an integer number (17500599).

Almost surely, 2^138351517 is an apocalyptic number.

It is an amenable number.

138351517 is a deficient number, since it is larger than the sum of its proper divisors (1653275).

138351517 is a wasteful number, since it uses less digits than its factorization.

138351517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879.

The product of its digits is 12600, while the sum is 34.

The square root of 138351517 is about 11762.2921660704. The cubic root of 138351517 is about 517.2033253288.

It can be divided in two parts, 1383 and 51517, that added together give a square (52900 = 230²).

The spelling of 138351517 in words is "one hundred thirty-eight million, three hundred fifty-one thousand, five hundred seventeen".