1223455647 has 4 divisors (see below), whose sum is σ = 1631274200. Its totient is φ = 815637096.

The previous prime is 1223455613. The next prime is 1223455663. The reversal of 1223455647 is 7465543221.

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

It is a de Polignac number, because none of the positive numbers 2^k-1223455647 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 (1223455697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203909272 + ... + 203909277.

It is an arithmetic number, because the mean of its divisors is an integer number (407818550).

Almost surely, 2^1223455647 is an apocalyptic number.

1223455647 is a deficient number, since it is larger than the sum of its proper divisors (407818553).

1223455647 is an equidigital number, since it uses as much as digits as its factorization.

1223455647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407818552.

The product of its digits is 201600, while the sum is 39.

The square root of 1223455647 is about 34977.9308564701. The cubic root of 1223455647 is about 1069.5376483828.

Adding to 1223455647 its reverse (7465543221), we get a palindrome (8688998868).

The spelling of 1223455647 in words is "one billion, two hundred twenty-three million, four hundred fifty-five thousand, six hundred forty-seven".