689276977 has 2 divisors, whose sum is σ = 689276978. Its totient is φ = 689276976.

The previous prime is 689276957. The next prime is 689276989. The reversal of 689276977 is 779672986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595555216 + 93721761 = 24404^2 + 9681^2 .

It is a cyclic number.

It is not a de Polignac number, because 689276977 - 2¹⁹ = 688752689 is a prime.

It is not a weakly prime, because it can be changed into another prime (689276957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344638488 + 344638489.

It is an arithmetic number, because the mean of its divisors is an integer number (344638489).

Almost surely, 2^689276977 is an apocalyptic number.

It is an amenable number.

689276977 is a deficient number, since it is larger than the sum of its proper divisors (1).

689276977 is an equidigital number, since it uses as much as digits as its factorization.

689276977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 61.

The square root of 689276977 is about 26254.0849583451. The cubic root of 689276977 is about 883.3468354251.

The spelling of 689276977 in words is "six hundred eighty-nine million, two hundred seventy-six thousand, nine hundred seventy-seven".