689275493 has 2 divisors, whose sum is σ = 689275494. Its totient is φ = 689275492.

The previous prime is 689275471. The next prime is 689275507. The reversal of 689275493 is 394572986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687593284 + 1682209 = 26222^2 + 1297^2 .

It is a cyclic number.

It is not a de Polignac number, because 689275493 - 2⁶ = 689275429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689275453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344637746 + 344637747.

It is an arithmetic number, because the mean of its divisors is an integer number (344637747).

Almost surely, 2^689275493 is an apocalyptic number.

It is an amenable number.

689275493 is a deficient number, since it is larger than the sum of its proper divisors (1).

689275493 is an equidigital number, since it uses as much as digits as its factorization.

689275493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 689275493 is about 26254.0566960613. The cubic root of 689275493 is about 883.3462014818.

The spelling of 689275493 in words is "six hundred eighty-nine million, two hundred seventy-five thousand, four hundred ninety-three".