65115217 has 4 divisors (see below), whose sum is σ = 66343860. Its totient is φ = 63886576.

The previous prime is 65115203. The next prime is 65115229. The reversal of 65115217 is 71251156.

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 23435281 + 41679936 = 4841^2 + 6456^2 .

It is a cyclic number.

It is not a de Polignac number, because 65115217 - 2¹⁵ = 65082449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65115247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614242 + ... + 614347.

It is an arithmetic number, because the mean of its divisors is an integer number (16585965).

Almost surely, 2^65115217 is an apocalyptic number.

It is an amenable number.

65115217 is a deficient number, since it is larger than the sum of its proper divisors (1228643).

65115217 is a wasteful number, since it uses less digits than its factorization.

65115217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228642.

The product of its digits is 2100, while the sum is 28.

The square root of 65115217 is about 8069.4000396560. The cubic root of 65115217 is about 402.3100027877.

The spelling of 65115217 in words is "sixty-five million, one hundred fifteen thousand, two hundred seventeen".