123135515 has 16 divisors (see below), whose sum is σ = 150674880. Its totient is φ = 96577920.

The previous prime is 123135499. The next prime is 123135521. The reversal of 123135515 is 515531321.

It is a happy number.

It is not a de Polignac number, because 123135515 - 2⁴ = 123135499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148121 + ... + 148949.

It is an arithmetic number, because the mean of its divisors is an integer number (9417180).

Almost surely, 2^123135515 is an apocalyptic number.

123135515 is a deficient number, since it is larger than the sum of its proper divisors (27539365).

123135515 is an equidigital number, since it uses as much as digits as its factorization.

123135515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382.

The product of its digits is 2250, while the sum is 26.

The square root of 123135515 is about 11096.6443125839. The cubic root of 123135515 is about 497.5015563531.

Adding to 123135515 its reverse (515531321), we get a palindrome (638666836).

The spelling of 123135515 in words is "one hundred twenty-three million, one hundred thirty-five thousand, five hundred fifteen".