1223551 has 8 divisors (see below), whose sum is σ = 1428480. Its totient is φ = 1026168.

The previous prime is 1223549. The next prime is 1223561. The reversal of 1223551 is 1553221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223551 - 2¹ = 1223549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 2188.

It is an arithmetic number, because the mean of its divisors is an integer number (178560).

2^1223551 is an apocalyptic number.

1223551 is a deficient number, since it is larger than the sum of its proper divisors (204929).

1223551 is an equidigital number, since it uses as much as digits as its factorization.

1223551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773.

The product of its digits is 300, while the sum is 19.

The square root of 1223551 is about 1106.1423958967. The cubic root of 1223551 is about 106.9565433336.

Adding to 1223551 its reverse (1553221), we get a palindrome (2776772).

The spelling of 1223551 in words is "one million, two hundred twenty-three thousand, five hundred fifty-one".