689791273 has 2 divisors, whose sum is σ = 689791274. Its totient is φ = 689791272.

The previous prime is 689791241. The next prime is 689791307. The reversal of 689791273 is 372197986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373378329 + 316412944 = 19323^2 + 17788^2 .

It is a cyclic number.

It is not a de Polignac number, because 689791273 - 2⁵ = 689791241 is a prime.

It is a super-4 number, since 4×689791273⁴ (a number of 36 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689791273.

It is not a weakly prime, because it can be changed into another prime (689791573) 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, 344895636 + 344895637.

It is an arithmetic number, because the mean of its divisors is an integer number (344895637).

Almost surely, 2^689791273 is an apocalyptic number.

It is an amenable number.

689791273 is a deficient number, since it is larger than the sum of its proper divisors (1).

689791273 is an equidigital number, since it uses as much as digits as its factorization.

689791273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 689791273 is about 26263.8777220730. The cubic root of 689791273 is about 883.5664804616.

The spelling of 689791273 in words is "six hundred eighty-nine million, seven hundred ninety-one thousand, two hundred seventy-three".