1223611 has 4 divisors (see below), whose sum is σ = 1246752. Its totient is φ = 1200472.

The previous prime is 1223603. The next prime is 1223633. The reversal of 1223611 is 1163221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1223611 - 2³ = 1223603 is a prime.

It is a Duffinian number.

1223611 is a lucky number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1223311) 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 in 3 ways as a sum of consecutive naturals, for example, 11491 + ... + 11596.

It is an arithmetic number, because the mean of its divisors is an integer number (311688).

2^1223611 is an apocalyptic number.

1223611 is a deficient number, since it is larger than the sum of its proper divisors (23141).

1223611 is an equidigital number, since it uses as much as digits as its factorization.

1223611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23140.

The product of its digits is 72, while the sum is 16.

The square root of 1223611 is about 1106.1695168463. The cubic root of 1223611 is about 106.9582916023.

Adding to 1223611 its reverse (1163221), we get a palindrome (2386832).

It can be divided in two parts, 1223 and 611, that multiplied together give a triangular number (747253 = T₁₂₂₂).

The spelling of 1223611 in words is "one million, two hundred twenty-three thousand, six hundred eleven".