1078644913 has 4 divisors (see below), whose sum is σ = 1078723440. Its totient is φ = 1078566388.

The previous prime is 1078644911. The next prime is 1078644997. The reversal of 1078644913 is 3194468701.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3194468701 = 173 ⋅18465137.

It is a cyclic number.

It is not a de Polignac number, because 1078644913 - 2¹ = 1078644911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1078644913.

It is not an unprimeable number, because it can be changed into a prime (1078644911) 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, 12643 + ... + 48136.

It is an arithmetic number, because the mean of its divisors is an integer number (269680860).

Almost surely, 2^1078644913 is an apocalyptic number.

It is an amenable number.

1078644913 is a deficient number, since it is larger than the sum of its proper divisors (78527).

1078644913 is an equidigital number, since it uses as much as digits as its factorization.

1078644913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78526.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1078644913 is about 32842.7299870154. The cubic root of 1078644913 is about 1025.5562835661.

The spelling of 1078644913 in words is "one billion, seventy-eight million, six hundred forty-four thousand, nine hundred thirteen".