789696989 has 2 divisors, whose sum is σ = 789696990. Its totient is φ = 789696988.

The previous prime is 789696977. The next prime is 789697001. The reversal of 789696989 is 989696987.

It is a balanced prime because it is at equal distance from previous prime (789696977) and next prime (789697001).

It can be written as a sum of positive squares in only one way, i.e., 499164964 + 290532025 = 22342^2 + 17045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-789696989 is a prime.

It is a super-2 number, since 2×789696989² = 1247242668871332242, which contains 22 as substring.

It is a Sophie Germain prime.

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

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (789696889) 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, 394848494 + 394848495.

It is an arithmetic number, because the mean of its divisors is an integer number (394848495).

Almost surely, 2^789696989 is an apocalyptic number.

It is an amenable number.

789696989 is a deficient number, since it is larger than the sum of its proper divisors (1).

789696989 is an equidigital number, since it uses as much as digits as its factorization.

789696989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105815808, while the sum is 71.

The square root of 789696989 is about 28101.5478043470. The cubic root of 789696989 is about 924.3153400590.

It can be divided in two parts, 78969 and 6989, that added together give a palindrome (85958).

The spelling of 789696989 in words is "seven hundred eighty-nine million, six hundred ninety-six thousand, nine hundred eighty-nine".