1215525265 has 4 divisors (see below), whose sum is σ = 1458630324. Its totient is φ = 972420208.

The previous prime is 1215525251. The next prime is 1215525277. The reversal of 1215525265 is 5625255121.

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 691847809 + 523677456 = 26303^2 + 22884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215525265 - 2²⁵ = 1181970833 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 1215525265.

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, 121552522 + ... + 121552531.

It is an arithmetic number, because the mean of its divisors is an integer number (364657581).

Almost surely, 2^1215525265 is an apocalyptic number.

It is an amenable number.

1215525265 is a deficient number, since it is larger than the sum of its proper divisors (243105059).

1215525265 is an equidigital number, since it uses as much as digits as its factorization.

1215525265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243105058.

The product of its digits is 30000, while the sum is 34.

The square root of 1215525265 is about 34864.3839039212. The cubic root of 1215525265 is about 1067.2217396920.

The spelling of 1215525265 in words is "one billion, two hundred fifteen million, five hundred twenty-five thousand, two hundred sixty-five".