123312515 has 8 divisors (see below), whose sum is σ = 148035840. Its totient is φ = 98609472.

The previous prime is 123312487. The next prime is 123312517. The reversal of 123312515 is 515213321.

It is a happy number.

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 123312515 - 2²² = 119118211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123312517) 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, 17246 + ... + 23324.

It is an arithmetic number, because the mean of its divisors is an integer number (18504480).

Almost surely, 2^123312515 is an apocalyptic number.

123312515 is a deficient number, since it is larger than the sum of its proper divisors (24723325).

123312515 is an equidigital number, since it uses as much as digits as its factorization.

123312515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141.

The product of its digits is 900, while the sum is 23.

The square root of 123312515 is about 11104.6168326512. The cubic root of 123312515 is about 497.7398185543.

Adding to 123312515 its reverse (515213321), we get a palindrome (638525836).

The spelling of 123312515 in words is "one hundred twenty-three million, three hundred twelve thousand, five hundred fifteen".