123115015 has 4 divisors (see below), whose sum is σ = 147738024. Its totient is φ = 98492008.

The previous prime is 123115009. The next prime is 123115033. The reversal of 123115015 is 510511321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 510511321 = 47 ⋅10861943.

It is a cyclic number.

It is not a de Polignac number, because 123115015 - 2³ = 123115007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123114983 and 123115001.

It is a congruent 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, 12311497 + ... + 12311506.

It is an arithmetic number, because the mean of its divisors is an integer number (36934506).

Almost surely, 2^123115015 is an apocalyptic number.

123115015 is a deficient number, since it is larger than the sum of its proper divisors (24623009).

123115015 is an equidigital number, since it uses as much as digits as its factorization.

123115015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24623008.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 123115015 is about 11095.7205714636. The cubic root of 123115015 is about 497.4739462632.

Adding to 123115015 its reverse (510511321), we get a palindrome (633626336).

The spelling of 123115015 in words is "one hundred twenty-three million, one hundred fifteen thousand, fifteen".