690817 has 2 divisors, whose sum is σ = 690818. Its totient is φ = 690816.

The previous prime is 690793. The next prime is 690839. The reversal of 690817 is 718096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690561 + 256 = 831^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 690817 - 2⁷ = 690689 is a prime.

It is a Chen prime.

690817 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (690887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345408 + 345409.

It is an arithmetic number, because the mean of its divisors is an integer number (345409).

2⁶⁹⁰⁸¹⁷ is an apocalyptic number.

It is an amenable number.

690817 is a deficient number, since it is larger than the sum of its proper divisors (1).

690817 is an equidigital number, since it uses as much as digits as its factorization.

690817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 690817 is about 831.1540170149. The cubic root of 690817 is about 88.4004221160.

The spelling of 690817 in words is "six hundred ninety thousand, eight hundred seventeen".