1215017065 has 4 divisors (see below), whose sum is σ = 1458020484. Its totient is φ = 972013648.

The previous prime is 1215017051. The next prime is 1215017071. The reversal of 1215017065 is 5607105121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 516789289 + 698227776 = 22733^2 + 26424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215017065 - 2⁹ = 1215016553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121501702 + ... + 121501711.

It is an arithmetic number, because the mean of its divisors is an integer number (364505121).

Almost surely, 2^1215017065 is an apocalyptic number.

It is an amenable number.

1215017065 is a deficient number, since it is larger than the sum of its proper divisors (243003419).

1215017065 is an equidigital number, since it uses as much as digits as its factorization.

1215017065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243003418.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 1215017065 is about 34857.0949018991. The cubic root of 1215017065 is about 1067.0729870754.

The spelling of 1215017065 in words is "one billion, two hundred fifteen million, seventeen thousand, sixty-five".