1994368513 has 2 divisors, whose sum is σ = 1994368514. Its totient is φ = 1994368512.

The previous prime is 1994368511. The next prime is 1994368517. The reversal of 1994368513 is 3158634991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1250824689 + 743543824 = 35367^2 + 27268^2 .

It is an emirp because it is prime and its reverse (3158634991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1994368513 - 2¹ = 1994368511 is a prime.

Together with 1994368511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1994368511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997184256 + 997184257.

It is an arithmetic number, because the mean of its divisors is an integer number (997184257).

Almost surely, 2^1994368513 is an apocalyptic number.

It is an amenable number.

1994368513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994368513 is an equidigital number, since it uses as much as digits as its factorization.

1994368513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 49.

The square root of 1994368513 is about 44658.3532275878. The cubic root of 1994368513 is about 1258.7374000784.

The spelling of 1994368513 in words is "one billion, nine hundred ninety-four million, three hundred sixty-eight thousand, five hundred thirteen".