138115511 has 8 divisors (see below), whose sum is σ = 142058448. Its totient is φ = 134200000.

The previous prime is 138115507. The next prime is 138115547. The reversal of 138115511 is 115511831.

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

It is a cyclic number.

It is not a de Polignac number, because 138115511 - 2² = 138115507 is a prime.

It is a super-2 number, since 2×138115511² = 38151788757582242, 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 (138115501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3581 + ... + 17001.

It is an arithmetic number, because the mean of its divisors is an integer number (17757306).

Almost surely, 2^138115511 is an apocalyptic number.

138115511 is a deficient number, since it is larger than the sum of its proper divisors (3942937).

138115511 is a wasteful number, since it uses less digits than its factorization.

138115511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13713.

The product of its digits is 600, while the sum is 26.

The square root of 138115511 is about 11752.2555707405. The cubic root of 138115511 is about 516.9090686813.

The spelling of 138115511 in words is "one hundred thirty-eight million, one hundred fifteen thousand, five hundred eleven".