215415265 has 16 divisors (see below), whose sum is σ = 278960976. Its totient is φ = 158745600.

The previous prime is 215415253. The next prime is 215415323. The reversal of 215415265 is 562514512.

It can be written as a sum of positive squares in 8 ways, for example, as 51165409 + 164249856 = 7153^2 + 12816^2 .

It is a de Polignac number, because none of the positive numbers 2^k-215415265 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30685 + ... + 37045.

It is an arithmetic number, because the mean of its divisors is an integer number (17435061).

Almost surely, 2^215415265 is an apocalyptic number.

It is an amenable number.

215415265 is a deficient number, since it is larger than the sum of its proper divisors (63545711).

215415265 is a wasteful number, since it uses less digits than its factorization.

215415265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its digits is 12000, while the sum is 31.

The square root of 215415265 is about 14677.0318865907. The cubic root of 215415265 is about 599.4580894059.

Adding to 215415265 its reverse (562514512), we get a palindrome (777929777).

The spelling of 215415265 in words is "two hundred fifteen million, four hundred fifteen thousand, two hundred sixty-five".