689195687 has 2 divisors, whose sum is σ = 689195688. Its totient is φ = 689195686.

The previous prime is 689195681. The next prime is 689195747. The reversal of 689195687 is 786591986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689195687 - 2⁸ = 689195431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689195681) 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, 344597843 + 344597844.

It is an arithmetic number, because the mean of its divisors is an integer number (344597844).

Almost surely, 2^689195687 is an apocalyptic number.

689195687 is a deficient number, since it is larger than the sum of its proper divisors (1).

689195687 is an equidigital number, since it uses as much as digits as its factorization.

689195687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 59.

The square root of 689195687 is about 26252.5367726626. The cubic root of 689195687 is about 883.3121081724.

The spelling of 689195687 in words is "six hundred eighty-nine million, one hundred ninety-five thousand, six hundred eighty-seven".