211465 has 4 divisors (see below), whose sum is σ = 253764. Its totient is φ = 169168.

The previous prime is 211457. The next prime is 211469. The reversal of 211465 is 564112.

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 64009 + 147456 = 253^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 211465 - 2³ = 211457 is a prime.

It is a Duffinian number.

211465 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (211469) 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, 21142 + ... + 21151.

It is an arithmetic number, because the mean of its divisors is an integer number (63441).

2²¹¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

211465 is a deficient number, since it is larger than the sum of its proper divisors (42299).

211465 is an equidigital number, since it uses as much as digits as its factorization.

211465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42298.

The product of its digits is 240, while the sum is 19.

The square root of 211465 is about 459.8532374573. The cubic root of 211465 is about 59.5771191241.

Adding to 211465 its reverse (564112), we get a palindrome (775577).

It can be divided in two parts, 211 and 465, that added together give a palindrome (676).

The spelling of 211465 in words is "two hundred eleven thousand, four hundred sixty-five".