689261 has 2 divisors, whose sum is σ = 689262. Its totient is φ = 689260.

The previous prime is 689257. The next prime is 689267. The reversal of 689261 is 162986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 361 = 830^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 689261 - 2² = 689257 is a prime.

It is a super-2 number, since 2×689261² = 950161452242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344630 + 344631.

It is an arithmetic number, because the mean of its divisors is an integer number (344631).

2⁶⁸⁹²⁶¹ is an apocalyptic number.

It is an amenable number.

689261 is a deficient number, since it is larger than the sum of its proper divisors (1).

689261 is an equidigital number, since it uses as much as digits as its factorization.

689261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 689261 is about 830.2174413971. The cubic root of 689261 is about 88.3340010234.

The spelling of 689261 in words is "six hundred eighty-nine thousand, two hundred sixty-one".