215102065 has 4 divisors (see below), whose sum is σ = 258122484. Its totient is φ = 172081648.

The previous prime is 215102057. The next prime is 215102101. The reversal of 215102065 is 560201512.

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 73753744 + 141348321 = 8588^2 + 11889^2 .

It is a cyclic number.

It is not a de Polignac number, because 215102065 - 2³ = 215102057 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21510202 + ... + 21510211.

It is an arithmetic number, because the mean of its divisors is an integer number (64530621).

Almost surely, 2^215102065 is an apocalyptic number.

It is an amenable number.

215102065 is a deficient number, since it is larger than the sum of its proper divisors (43020419).

215102065 is an equidigital number, since it uses as much as digits as its factorization.

215102065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43020418.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 215102065 is about 14666.3582732729. The cubic root of 215102065 is about 599.1674239332.

Adding to 215102065 its reverse (560201512), we get a palindrome (775303577).

The spelling of 215102065 in words is "two hundred fifteen million, one hundred two thousand, sixty-five".