1215613123 has 8 divisors (see below), whose sum is σ = 1242777600. Its totient is φ = 1188502920.

The previous prime is 1215613121. The next prime is 1215613127. The reversal of 1215613123 is 3213165121.

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 1215613123 - 2¹ = 1215613121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215613121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33528 + ... + 59626.

It is an arithmetic number, because the mean of its divisors is an integer number (155347200).

Almost surely, 2^1215613123 is an apocalyptic number.

1215613123 is a deficient number, since it is larger than the sum of its proper divisors (27164477).

1215613123 is an equidigital number, since it uses as much as digits as its factorization.

1215613123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27137.

The product of its digits is 1080, while the sum is 25.

The square root of 1215613123 is about 34865.6438776054. The cubic root of 1215613123 is about 1067.2474519530.

Adding to 1215613123 its reverse (3213165121), we get a palindrome (4428778244).

The spelling of 1215613123 in words is "one billion, two hundred fifteen million, six hundred thirteen thousand, one hundred twenty-three".