989694709 has 2 divisors, whose sum is σ = 989694710. Its totient is φ = 989694708.

The previous prime is 989694703. The next prime is 989694731. The reversal of 989694709 is 907496989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977812900 + 11881809 = 31270^2 + 3447^2 .

It is a cyclic number.

It is not a de Polignac number, because 989694709 - 2¹¹ = 989692661 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989694703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494847354 + 494847355.

It is an arithmetic number, because the mean of its divisors is an integer number (494847355).

Almost surely, 2^989694709 is an apocalyptic number.

It is an amenable number.

989694709 is a deficient number, since it is larger than the sum of its proper divisors (1).

989694709 is an equidigital number, since it uses as much as digits as its factorization.

989694709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The square root of 989694709 is about 31459.4136785796. The cubic root of 989694709 is about 996.5530350847.

The spelling of 989694709 in words is "nine hundred eighty-nine million, six hundred ninety-four thousand, seven hundred nine".