138117515 has 4 divisors (see below), whose sum is σ = 165741024. Its totient is φ = 110494008.

The previous prime is 138117467. The next prime is 138117547. The reversal of 138117515 is 515711831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138117515 - 2¹² = 138113419 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13811747 + ... + 13811756.

It is an arithmetic number, because the mean of its divisors is an integer number (41435256).

Almost surely, 2^138117515 is an apocalyptic number.

138117515 is a deficient number, since it is larger than the sum of its proper divisors (27623509).

138117515 is an equidigital number, since it uses as much as digits as its factorization.

138117515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27623508.

The product of its digits is 4200, while the sum is 32.

The square root of 138117515 is about 11752.3408306601. The cubic root of 138117515 is about 516.9115687162.

The spelling of 138117515 in words is "one hundred thirty-eight million, one hundred seventeen thousand, five hundred fifteen".