1229311 has 2 divisors, whose sum is σ = 1229312. Its totient is φ = 1229310.

The previous prime is 1229309. The next prime is 1229317. The reversal of 1229311 is 1139221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1229311 - 2¹ = 1229309 is a prime.

It is a super-2 number, since 2×1229311² = 3022411069442, which contains 22 as substring.

Together with 1229309, it forms a pair of twin primes.

It is equal to p₉₅₀₀₅ and since 1229311 and 95005 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614655 + 614656.

It is an arithmetic number, because the mean of its divisors is an integer number (614656).

2^1229311 is an apocalyptic number.

1229311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229311 is an equidigital number, since it uses as much as digits as its factorization.

1229311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 19.

The square root of 1229311 is about 1108.7429819395. The cubic root of 1229311 is about 107.1241171881.

It can be divided in two parts, 1229 and 311, that added together give a triangular number (1540 = T₅₅).

The spelling of 1229311 in words is "one million, two hundred twenty-nine thousand, three hundred eleven".