• Deleting all the even digits from 21299 we obtain a prime of 198 digits.
1299 has 4 divisors (see below), whose sum is σ = 1736. Its totient is φ = 864.
The previous prime is 1297. The next prime is 1301. The reversal of 1299 is 9921.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9921 = 3 ⋅3307.
It is an interprime number because it is at equal distance from previous prime (1297) and next prime (1301).
It is not a de Polignac number, because 1299 - 21 = 1297 is a prime.
It is a D-number.
It is a Duffinian number.
1299 is a modest number, since divided by 99 gives 12 as remainder.
It is a plaindrome in base 10, base 13 and base 14.
It is a nialpdrome in base 11.
It is not an unprimeable number, because it can be changed into a prime (1291) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214 + ... + 219.
It is an arithmetic number, because the mean of its divisors is an integer number (434).
1299 is a deficient number, since it is larger than the sum of its proper divisors (437).
1299 is an equidigital number, since it uses as much as digits as its factorization.
1299 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 436.
The product of its digits is 162, while the sum is 21.
The square root of 1299 is about 36.0416425819. The cubic root of 1299 is about 10.9111296695.
It can be divided in two parts, 12 and 99, that added together give a palindrome (111).
The spelling of 1299 in words is "one thousand, two hundred ninety-nine".
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