1994368511 has 2 divisors, whose sum is σ = 1994368512. Its totient is φ = 1994368510.

The previous prime is 1994368507. The next prime is 1994368513. The reversal of 1994368511 is 1158634991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1994368511 - 2² = 1994368507 is a prime.

It is a Sophie Germain prime.

Together with 1994368513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994368513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997184255 + 997184256.

It is an arithmetic number, because the mean of its divisors is an integer number (997184256).

Almost surely, 2^1994368511 is an apocalyptic number.

1994368511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994368511 is an equidigital number, since it uses as much as digits as its factorization.

1994368511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 1994368511 is about 44658.3532051956. The cubic root of 1994368511 is about 1258.7373996576.

The spelling of 1994368511 in words is "one billion, nine hundred ninety-four million, three hundred sixty-eight thousand, five hundred eleven".