1320217615 has 16 divisors (see below), whose sum is σ = 1636551936. Its totient is φ = 1021363200.

The previous prime is 1320217579. The next prime is 1320217643. The reversal of 1320217615 is 5167120231.

It is a happy number.

It is not a de Polignac number, because 1320217615 - 2⁹ = 1320217103 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 320509 + ... + 324601.

It is an arithmetic number, because the mean of its divisors is an integer number (102284496).

Almost surely, 2^1320217615 is an apocalyptic number.

1320217615 is a deficient number, since it is larger than the sum of its proper divisors (316334321).

1320217615 is a wasteful number, since it uses less digits than its factorization.

1320217615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1320217615 is about 36334.7989536202. The cubic root of 1320217615 is about 1097.0215887993.

Adding to 1320217615 its reverse (5167120231), we get a palindrome (6487337846).

The spelling of 1320217615 in words is "one billion, three hundred twenty million, two hundred seventeen thousand, six hundred fifteen".