689405963 has 2 divisors, whose sum is σ = 689405964. Its totient is φ = 689405962.

The previous prime is 689405929. The next prime is 689405989. The reversal of 689405963 is 369504986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689405963 - 2¹⁴ = 689389579 is a prime.

It is not a weakly prime, because it can be changed into another prime (689405923) 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, 344702981 + 344702982.

It is an arithmetic number, because the mean of its divisors is an integer number (344702982).

Almost surely, 2^689405963 is an apocalyptic number.

689405963 is a deficient number, since it is larger than the sum of its proper divisors (1).

689405963 is an equidigital number, since it uses as much as digits as its factorization.

689405963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 689405963 is about 26256.5413373506. The cubic root of 689405963 is about 883.4019329027.

The spelling of 689405963 in words is "six hundred eighty-nine million, four hundred five thousand, nine hundred sixty-three".