689566051 has 2 divisors, whose sum is σ = 689566052. Its totient is φ = 689566050.

The previous prime is 689566039. The next prime is 689566057. The reversal of 689566051 is 150665986.

689566051 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 689566051 - 2¹¹ = 689564003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689565992 and 689566010.

It is not a weakly prime, because it can be changed into another prime (689566057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344783025 + 344783026.

It is an arithmetic number, because the mean of its divisors is an integer number (344783026).

Almost surely, 2^689566051 is an apocalyptic number.

689566051 is a deficient number, since it is larger than the sum of its proper divisors (1).

689566051 is an equidigital number, since it uses as much as digits as its factorization.

689566051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 689566051 is about 26259.5896959568. The cubic root of 689566051 is about 883.4703063097.

The spelling of 689566051 in words is "six hundred eighty-nine million, five hundred sixty-six thousand, fifty-one".