689705297 has 2 divisors, whose sum is σ = 689705298. Its totient is φ = 689705296.

The previous prime is 689705293. The next prime is 689705309. The reversal of 689705297 is 792507986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647142721 + 42562576 = 25439^2 + 6524^2 .

It is a cyclic number.

It is not a de Polignac number, because 689705297 - 2² = 689705293 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689705293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344852648 + 344852649.

It is an arithmetic number, because the mean of its divisors is an integer number (344852649).

Almost surely, 2^689705297 is an apocalyptic number.

It is an amenable number.

689705297 is a deficient number, since it is larger than the sum of its proper divisors (1).

689705297 is an equidigital number, since it uses as much as digits as its factorization.

689705297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 689705297 is about 26262.2408982935. The cubic root of 689705297 is about 883.5297695168.

The spelling of 689705297 in words is "six hundred eighty-nine million, seven hundred five thousand, two hundred ninety-seven".