689705293 has 2 divisors, whose sum is σ = 689705294. Its totient is φ = 689705292.

The previous prime is 689705287. The next prime is 689705297. The reversal of 689705293 is 392507986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599417289 + 90288004 = 24483^2 + 9502^2 .

It is a cyclic number.

It is not a de Polignac number, because 689705293 - 2¹³ = 689697101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689705297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344852646 + 344852647.

It is an arithmetic number, because the mean of its divisors is an integer number (344852647).

Almost surely, 2^689705293 is an apocalyptic number.

It is an amenable number.

689705293 is a deficient number, since it is larger than the sum of its proper divisors (1).

689705293 is an equidigital number, since it uses as much as digits as its factorization.

689705293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 689705293 is about 26262.2408221385. The cubic root of 689705293 is about 883.5297678087.

The spelling of 689705293 in words is "six hundred eighty-nine million, seven hundred five thousand, two hundred ninety-three".