689750261 has 2 divisors, whose sum is σ = 689750262. Its totient is φ = 689750260.

The previous prime is 689750249. The next prime is 689750273. The reversal of 689750261 is 162057986.

It is a balanced prime because it is at equal distance from previous prime (689750249) and next prime (689750273).

It can be written as a sum of positive squares in only one way, i.e., 400240036 + 289510225 = 20006^2 + 17015^2 .

It is a cyclic number.

It is not a de Polignac number, because 689750261 - 2¹⁸ = 689488117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689750561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344875130 + 344875131.

It is an arithmetic number, because the mean of its divisors is an integer number (344875131).

Almost surely, 2^689750261 is an apocalyptic number.

It is an amenable number.

689750261 is a deficient number, since it is larger than the sum of its proper divisors (1).

689750261 is an equidigital number, since it uses as much as digits as its factorization.

689750261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 689750261 is about 26263.0969422877. The cubic root of 689750261 is about 883.5489691031.

The spelling of 689750261 in words is "six hundred eighty-nine million, seven hundred fifty thousand, two hundred sixty-one".