1994323913 has 2 divisors, whose sum is σ = 1994323914. Its totient is φ = 1994323912.

The previous prime is 1994323897. The next prime is 1994323921. The reversal of 1994323913 is 3193234991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1637982784 + 356341129 = 40472^2 + 18877^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994323913 - 2⁴ = 1994323897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994323993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997161956 + 997161957.

It is an arithmetic number, because the mean of its divisors is an integer number (997161957).

Almost surely, 2^1994323913 is an apocalyptic number.

It is an amenable number.

1994323913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994323913 is an equidigital number, since it uses as much as digits as its factorization.

1994323913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 44.

The square root of 1994323913 is about 44657.8538781254. The cubic root of 1994323913 is about 1258.7280169736.

The spelling of 1994323913 in words is "one billion, nine hundred ninety-four million, three hundred twenty-three thousand, nine hundred thirteen".