994556789 has 2 divisors, whose sum is σ = 994556790. Its totient is φ = 994556788.

The previous prime is 994556779. The next prime is 994556813. The reversal of 994556789 is 987655499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881496100 + 113060689 = 29690^2 + 10633^2 .

It is an emirp because it is prime and its reverse (987655499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994556789 - 2¹² = 994552693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994556779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497278394 + 497278395.

It is an arithmetic number, because the mean of its divisors is an integer number (497278395).

Almost surely, 2^994556789 is an apocalyptic number.

It is an amenable number.

994556789 is a deficient number, since it is larger than the sum of its proper divisors (1).

994556789 is an equidigital number, since it uses as much as digits as its factorization.

994556789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24494400, while the sum is 62.

The square root of 994556789 is about 31536.5944420129. The cubic root of 994556789 is about 998.1822942812.

The spelling of 994556789 in words is "nine hundred ninety-four million, five hundred fifty-six thousand, seven hundred eighty-nine".