1178878321 has 4 divisors (see below), whose sum is σ = 1187359600. Its totient is φ = 1170397044.

The previous prime is 1178878193. The next prime is 1178878357. The reversal of 1178878321 is 1238788711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1178878321 - 2⁷ = 1178878193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1178878121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4240431 + ... + 4240708.

It is an arithmetic number, because the mean of its divisors is an integer number (296839900).

Almost surely, 2^1178878321 is an apocalyptic number.

It is an amenable number.

1178878321 is a deficient number, since it is larger than the sum of its proper divisors (8481279).

1178878321 is an equidigital number, since it uses as much as digits as its factorization.

1178878321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8481278.

The product of its digits is 150528, while the sum is 46.

The square root of 1178878321 is about 34334.7975237950. The cubic root of 1178878321 is about 1056.3868678493.

It can be divided in two parts, 11788 and 78321, that added together give a palindrome (90109).

The spelling of 1178878321 in words is "one billion, one hundred seventy-eight million, eight hundred seventy-eight thousand, three hundred twenty-one".