689463791 has 2 divisors, whose sum is σ = 689463792. Its totient is φ = 689463790.

The previous prime is 689463779. The next prime is 689463799. The reversal of 689463791 is 197364986.

689463791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689463791 - 2²⁶ = 622354927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689463799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344731895 + 344731896.

It is an arithmetic number, because the mean of its divisors is an integer number (344731896).

Almost surely, 2^689463791 is an apocalyptic number.

689463791 is a deficient number, since it is larger than the sum of its proper divisors (1).

689463791 is an equidigital number, since it uses as much as digits as its factorization.

689463791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 689463791 is about 26257.6425255582. The cubic root of 689463791 is about 883.4266323983.

The spelling of 689463791 in words is "six hundred eighty-nine million, four hundred sixty-three thousand, seven hundred ninety-one".