1215652265 has 4 divisors (see below), whose sum is σ = 1458782724. Its totient is φ = 972521808.

The previous prime is 1215652241. The next prime is 1215652289. The reversal of 1215652265 is 5622565121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5622565121 = 89 ⋅63174889.

It is an interprime number because it is at equal distance from previous prime (1215652241) and next prime (1215652289).

It can be written as a sum of positive squares in 2 ways, for example, as 183765136 + 1031887129 = 13556^2 + 32123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215652265 - 2¹² = 1215648169 is a prime.

It is a Duffinian number.

It is a Curzon 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, 121565222 + ... + 121565231.

It is an arithmetic number, because the mean of its divisors is an integer number (364695681).

Almost surely, 2^1215652265 is an apocalyptic number.

It is an amenable number.

1215652265 is a deficient number, since it is larger than the sum of its proper divisors (243130459).

1215652265 is an equidigital number, since it uses as much as digits as its factorization.

1215652265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243130458.

The product of its digits is 36000, while the sum is 35.

The square root of 1215652265 is about 34866.2051993044. The cubic root of 1215652265 is about 1067.2589067354.

The spelling of 1215652265 in words is "one billion, two hundred fifteen million, six hundred fifty-two thousand, two hundred sixty-five".