686958229 has 2 divisors, whose sum is σ = 686958230. Its totient is φ = 686958228.

The previous prime is 686958211. The next prime is 686958247. The reversal of 686958229 is 922859686.

It is a balanced prime because it is at equal distance from previous prime (686958211) and next prime (686958247).

It can be written as a sum of positive squares in only one way, i.e., 625100004 + 61858225 = 25002^2 + 7865^2 .

It is a cyclic number.

It is not a de Polignac number, because 686958229 - 2⁵ = 686958197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686958229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686958529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343479114 + 343479115.

It is an arithmetic number, because the mean of its divisors is an integer number (343479115).

Almost surely, 2^686958229 is an apocalyptic number.

It is an amenable number.

686958229 is a deficient number, since it is larger than the sum of its proper divisors (1).

686958229 is an equidigital number, since it uses as much as digits as its factorization.

686958229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 55.

The square root of 686958229 is about 26209.8880005238. Note that the first 3 decimals coincide. The cubic root of 686958229 is about 882.3551877134.

The spelling of 686958229 in words is "six hundred eighty-six million, nine hundred fifty-eight thousand, two hundred twenty-nine".