138115481 has 8 divisors (see below), whose sum is σ = 159379584. Its totient is φ = 117234720.

The previous prime is 138115477. The next prime is 138115499. The reversal of 138115481 is 184511831.

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 138115481 - 2² = 138115477 is a prime.

It is a super-2 number, since 2×138115481² = 38151772183722722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138115981) 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, 95060 + ... + 96501.

It is an arithmetic number, because the mean of its divisors is an integer number (19922448).

Almost surely, 2^138115481 is an apocalyptic number.

It is an amenable number.

138115481 is a deficient number, since it is larger than the sum of its proper divisors (21264103).

138115481 is a wasteful number, since it uses less digits than its factorization.

138115481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191671.

The product of its digits is 3840, while the sum is 32.

The square root of 138115481 is about 11752.2542943897. The cubic root of 138115481 is about 516.9090312555.

The spelling of 138115481 in words is "one hundred thirty-eight million, one hundred fifteen thousand, four hundred eighty-one".