65215211 has 4 divisors (see below), whose sum is σ = 66040800. Its totient is φ = 64389624.

The previous prime is 65215193. The next prime is 65215217. The reversal of 65215211 is 11251256.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65215211 - 2⁶ = 65215147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65215217) 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, 412676 + ... + 412833.

It is an arithmetic number, because the mean of its divisors is an integer number (16510200).

Almost surely, 2^65215211 is an apocalyptic number.

65215211 is a deficient number, since it is larger than the sum of its proper divisors (825589).

65215211 is an equidigital number, since it uses as much as digits as its factorization.

65215211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825588.

The product of its digits is 600, while the sum is 23.

The square root of 65215211 is about 8075.5935385580. The cubic root of 65215211 is about 402.5158328713.

Adding to 65215211 its reverse (11251256), we get a palindrome (76466467).

The spelling of 65215211 in words is "sixty-five million, two hundred fifteen thousand, two hundred eleven".