994551689 has 2 divisors, whose sum is σ = 994551690. Its totient is φ = 994551688.

The previous prime is 994551683. The next prime is 994551709. The reversal of 994551689 is 986155499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991746064 + 2805625 = 31492^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 994551689 - 2⁴ = 994551673 is a prime.

It is not a weakly prime, because it can be changed into another prime (994551683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497275844 + 497275845.

It is an arithmetic number, because the mean of its divisors is an integer number (497275845).

Almost surely, 2^994551689 is an apocalyptic number.

It is an amenable number.

994551689 is a deficient number, since it is larger than the sum of its proper divisors (1).

994551689 is an equidigital number, since it uses as much as digits as its factorization.

994551689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3499200, while the sum is 56.

The square root of 994551689 is about 31536.5135834639. The cubic root of 994551689 is about 998.1805880812.

The spelling of 994551689 in words is "nine hundred ninety-four million, five hundred fifty-one thousand, six hundred eighty-nine".