689487247 has 2 divisors, whose sum is σ = 689487248. Its totient is φ = 689487246.

The previous prime is 689487223. The next prime is 689487251. The reversal of 689487247 is 742784986.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689487247 is a prime.

It is a super-3 number, since 3×689487247³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689487287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344743623 + 344743624.

It is an arithmetic number, because the mean of its divisors is an integer number (344743624).

Almost surely, 2^689487247 is an apocalyptic number.

689487247 is a deficient number, since it is larger than the sum of its proper divisors (1).

689487247 is an equidigital number, since it uses as much as digits as its factorization.

689487247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 55.

The square root of 689487247 is about 26258.0891726721. The cubic root of 689487247 is about 883.4366505314.

The spelling of 689487247 in words is "six hundred eighty-nine million, four hundred eighty-seven thousand, two hundred forty-seven".