1994920513 has 2 divisors, whose sum is σ = 1994920514. Its totient is φ = 1994920512.

The previous prime is 1994920481. The next prime is 1994920537. The reversal of 1994920513 is 3150294991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220244624 + 774675889 = 34932^2 + 27833^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994920513 - 2⁵ = 1994920481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1994920513.

It is not a weakly prime, because it can be changed into another prime (1994920553) 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, 997460256 + 997460257.

It is an arithmetic number, because the mean of its divisors is an integer number (997460257).

Almost surely, 2^1994920513 is an apocalyptic number.

It is an amenable number.

1994920513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994920513 is an equidigital number, since it uses as much as digits as its factorization.

1994920513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 1994920513 is about 44664.5330547628. The cubic root of 1994920513 is about 1258.8535202013.

The spelling of 1994920513 in words is "one billion, nine hundred ninety-four million, nine hundred twenty thousand, five hundred thirteen".