1216849 has 2 divisors, whose sum is σ = 1216850. Its totient is φ = 1216848.
The previous prime is 1216847. The next prime is 1216867. The reversal of 1216849 is 9486121.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1030225 + 186624 = 1015^2 + 432^2 .
It is a cyclic number.
It is not a de Polignac number, because 1216849 - 21 = 1216847 is a prime.
Together with 1216847, it forms a pair of twin primes.
It is a self number, because there is not a number n which added to its sum of digits gives 1216849.
It is not a weakly prime, because it can be changed into another prime (1216841) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608424 + 608425.
It is an arithmetic number, because the mean of its divisors is an integer number (608425).
21216849 is an apocalyptic number.
It is an amenable number.
1216849 is a deficient number, since it is larger than the sum of its proper divisors (1).
1216849 is an equidigital number, since it uses as much as digits as its factorization.
1216849 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3456, while the sum is 31.
The square root of 1216849 is about 1103.1087888327. The cubic root of 1216849 is about 106.7609008827.
It can be divided in two parts, 12 and 16849, that added together give a palindrome (16861).
The spelling of 1216849 in words is "one million, two hundred sixteen thousand, eight hundred forty-nine".
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