138117511 has 4 divisors (see below), whose sum is σ = 157848592. Its totient is φ = 118386432.

The previous prime is 138117467. The next prime is 138117547. The reversal of 138117511 is 115711831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115711831 = 1459 ⋅79309.

It is a cyclic number.

It is not a de Polignac number, because 138117511 - 2¹⁵ = 138084743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138117511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138112511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9865530 + ... + 9865543.

It is an arithmetic number, because the mean of its divisors is an integer number (39462148).

Almost surely, 2^138117511 is an apocalyptic number.

138117511 is a deficient number, since it is larger than the sum of its proper divisors (19731081).

138117511 is an equidigital number, since it uses as much as digits as its factorization.

138117511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19731080.

The product of its digits is 840, while the sum is 28.

The square root of 138117511 is about 11752.3406604812. The cubic root of 138117511 is about 516.9115637261.

It can be divided in two parts, 138 and 117511, that added together give a 6-th power (117649 = 7⁶).

The spelling of 138117511 in words is "one hundred thirty-eight million, one hundred seventeen thousand, five hundred eleven".