1233478321 has 2 divisors, whose sum is σ = 1233478322. Its totient is φ = 1233478320.

The previous prime is 1233478319. The next prime is 1233478327. The reversal of 1233478321 is 1238743321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1003622400 + 229855921 = 31680^2 + 15161^2 .

It is an emirp because it is prime and its reverse (1238743321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1233478321 - 2¹ = 1233478319 is a prime.

Together with 1233478319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1233478327) 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, 616739160 + 616739161.

It is an arithmetic number, because the mean of its divisors is an integer number (616739161).

Almost surely, 2^1233478321 is an apocalyptic number.

It is an amenable number.

1233478321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233478321 is an equidigital number, since it uses as much as digits as its factorization.

1233478321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 34.

The square root of 1233478321 is about 35120.9100252257. The cubic root of 1233478321 is about 1072.4502965612.

The spelling of 1233478321 in words is "one billion, two hundred thirty-three million, four hundred seventy-eight thousand, three hundred twenty-one".