1211 has 4 divisors (see below), whose sum is σ = 1392. Its totient is φ = 1032.

The previous prime is 1201. The next prime is 1213. The reversal of 1211 is 1121.

Adding to 1211 its reverse (1121), we get a palindrome (2332).

Multipling 1211 by its reverse (1121), we get a palindrome (1357531).

It can be divided in two parts, 1 and 211, that added together give a palindrome (212).

1211 = T_{15} + T_{16} + ... +
T_{21}.

1211 = 10^{2} + 11^{2} + ... + 16^{2}.

It is a happy number.

1211 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1121 = 19 ⋅59.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^{k}-1211 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15 and base 16.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to *n*+sod(*n*) for *n* = 1195 and 1204.

It is not an unprimeable number, because it can be changed into a prime (1213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 93.

It is an arithmetic number, because the mean of its divisors is an integer number (348).

1211 is a deficient number, since it is larger than the sum of its proper divisors (181).

1211 is an equidigital number, since it uses as much as digits as its factorization.

1211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 2, while the sum is 5.

The square root of 1211 is about 34.7994252826. The cubic root of 1211 is about 10.6589571027.

The spelling of 1211 in words is "one thousand, two hundred eleven", and thus it is an iban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.039 sec. • engine limits •