1613994689 has 2 divisors, whose sum is σ = 1613994690. Its totient is φ = 1613994688.

The previous prime is 1613994673. The next prime is 1613994721. The reversal of 1613994689 is 9864993161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 886074289 + 727920400 = 29767^2 + 26980^2 .

It is an emirp because it is prime and its reverse (9864993161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1613994689 - 2⁴ = 1613994673 is a prime.

It is a super-2 number, since 2×1613994689² = 5209957712240413442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1613994659) 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, 806997344 + 806997345.

It is an arithmetic number, because the mean of its divisors is an integer number (806997345).

Almost surely, 2^1613994689 is an apocalyptic number.

It is an amenable number.

1613994689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613994689 is an equidigital number, since it uses as much as digits as its factorization.

1613994689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 56.

The square root of 1613994689 is about 40174.5527542000. The cubic root of 1613994689 is about 1173.0072609886.

The spelling of 1613994689 in words is "one billion, six hundred thirteen million, nine hundred ninety-four thousand, six hundred eighty-nine".