15216065 has 16 divisors (see below), whose sum is σ = 18886608. Its totient is φ = 11759616.

The previous prime is 15216059. The next prime is 15216079. The reversal of 15216065 is 56061251.

It can be written as a sum of positive squares in 8 ways, for example, as 37249 + 15178816 = 193^2 + 3896^2 .

It is a cyclic number.

It is not a de Polignac number, because 15216065 - 2⁴ = 15216049 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42929 + ... + 43281.

It is an arithmetic number, because the mean of its divisors is an integer number (1180413).

Almost surely, 2^15216065 is an apocalyptic number.

It is an amenable number.

15216065 is a deficient number, since it is larger than the sum of its proper divisors (3670543).

15216065 is a wasteful number, since it uses less digits than its factorization.

15216065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 15216065 is about 3900.7774866044. Note that the first 3 decimals coincide. The cubic root of 15216065 is about 247.7997049523.

The spelling of 15216065 in words is "fifteen million, two hundred sixteen thousand, sixty-five".