689276989 has 2 divisors, whose sum is σ = 689276990. Its totient is φ = 689276988.

The previous prime is 689276977. The next prime is 689276993. The reversal of 689276989 is 989672986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480705625 + 208571364 = 21925^2 + 14442^2 .

It is a cyclic number.

It is not a de Polignac number, because 689276989 - 2⁵ = 689276957 is a prime.

It is a super-2 number, since 2×689276989² = 950205535129812242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689276989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689277989) 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, 344638494 + 344638495.

It is an arithmetic number, because the mean of its divisors is an integer number (344638495).

Almost surely, 2^689276989 is an apocalyptic number.

It is an amenable number.

689276989 is a deficient number, since it is larger than the sum of its proper divisors (1).

689276989 is an equidigital number, since it uses as much as digits as its factorization.

689276989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 64.

The square root of 689276989 is about 26254.0851868809. The cubic root of 689276989 is about 883.3468405513.

The spelling of 689276989 in words is "six hundred eighty-nine million, two hundred seventy-six thousand, nine hundred eighty-nine".