1994308993 has 2 divisors, whose sum is σ = 1994308994. Its totient is φ = 1994308992.

The previous prime is 1994308919. The next prime is 1994309041. The reversal of 1994308993 is 3998034991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1565943184 + 428365809 = 39572^2 + 20697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994308993 - 2²⁵ = 1960754561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994308903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997154496 + 997154497.

It is an arithmetic number, because the mean of its divisors is an integer number (997154497).

Almost surely, 2^1994308993 is an apocalyptic number.

It is an amenable number.

1994308993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994308993 is an equidigital number, since it uses as much as digits as its factorization.

1994308993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 55.

The square root of 1994308993 is about 44657.6868299288. The cubic root of 1994308993 is about 1258.7248780203.

The spelling of 1994308993 in words is "one billion, nine hundred ninety-four million, three hundred eight thousand, nine hundred ninety-three".