1215518465 has 16 divisors (see below), whose sum is σ = 1702467072. Its totient is φ = 815763264.

The previous prime is 1215518449. The next prime is 1215518471. The reversal of 1215518465 is 5648155121.

It is a cyclic number.

It is not a de Polignac number, because 1215518465 - 2⁴ = 1215518449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 367814 + ... + 371103.

It is an arithmetic number, because the mean of its divisors is an integer number (106404192).

Almost surely, 2^1215518465 is an apocalyptic number.

It is an amenable number.

1215518465 is a deficient number, since it is larger than the sum of its proper divisors (486948607).

1215518465 is an equidigital number, since it uses as much as digits as its factorization.

1215518465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738976.

The product of its digits is 48000, while the sum is 38.

The square root of 1215518465 is about 34864.2863830597. The cubic root of 1215518465 is about 1067.2197495726.

The spelling of 1215518465 in words is "one billion, two hundred fifteen million, five hundred eighteen thousand, four hundred sixty-five".