1215216115 has 4 divisors (see below), whose sum is σ = 1458259344. Its totient is φ = 972172888.

The previous prime is 1215216113. The next prime is 1215216199. The reversal of 1215216115 is 5116125121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5116125121 = 30661 ⋅166861.

It is a cyclic number.

It is not a de Polignac number, because 1215216115 - 2¹ = 1215216113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215216115.

It is not an unprimeable number, because it can be changed into a prime (1215216113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121521607 + ... + 121521616.

It is an arithmetic number, because the mean of its divisors is an integer number (364564836).

Almost surely, 2^1215216115 is an apocalyptic number.

1215216115 is a deficient number, since it is larger than the sum of its proper divisors (243043229).

1215216115 is an equidigital number, since it uses as much as digits as its factorization.

1215216115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243043228.

The product of its digits is 600, while the sum is 25.

The square root of 1215216115 is about 34859.9500143072. The cubic root of 1215216115 is about 1067.1312549210.

The spelling of 1215216115 in words is "one billion, two hundred fifteen million, two hundred sixteen thousand, one hundred fifteen".