1994118719 has 2 divisors, whose sum is σ = 1994118720. Its totient is φ = 1994118718.

The previous prime is 1994118689. The next prime is 1994118787. The reversal of 1994118719 is 9178114991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1994118719 - 2⁸ = 1994118463 is a prime.

It is a super-2 number, since 2×1994118719² = 7953018930932401922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994118319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997059359 + 997059360.

It is an arithmetic number, because the mean of its divisors is an integer number (997059360).

Almost surely, 2^1994118719 is an apocalyptic number.

1994118719 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994118719 is an equidigital number, since it uses as much as digits as its factorization.

1994118719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 50.

The square root of 1994118719 is about 44655.5564179868. The cubic root of 1994118719 is about 1258.6848457358.

The spelling of 1994118719 in words is "one billion, nine hundred ninety-four million, one hundred eighteen thousand, seven hundred nineteen".