1223316555 has 32 divisors (see below), whose sum is σ = 1986985728. Its totient is φ = 642614400.

The previous prime is 1223316547. The next prime is 1223316559. The reversal of 1223316555 is 5556133221.

It is a happy number.

It is not a de Polignac number, because 1223316555 - 2³ = 1223316547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223316559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288400 + ... + 292610.

It is an arithmetic number, because the mean of its divisors is an integer number (62093304).

Almost surely, 2^1223316555 is an apocalyptic number.

1223316555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1223316555 is a deficient number, since it is larger than the sum of its proper divisors (763669173).

1223316555 is a wasteful number, since it uses less digits than its factorization.

1223316555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507.

The product of its digits is 27000, while the sum is 33.

The square root of 1223316555 is about 34975.9425176792. The cubic root of 1223316555 is about 1069.4971157137.

Adding to 1223316555 its reverse (5556133221), we get a palindrome (6779449776).

The spelling of 1223316555 in words is "one billion, two hundred twenty-three million, three hundred sixteen thousand, five hundred fifty-five".