686149259 has 2 divisors, whose sum is σ = 686149260. Its totient is φ = 686149258.

The previous prime is 686149241. The next prime is 686149267. The reversal of 686149259 is 952941686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686149259 - 2⁸ = 686149003 is a prime.

It is not a weakly prime, because it can be changed into another prime (686149859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343074629 + 343074630.

It is an arithmetic number, because the mean of its divisors is an integer number (343074630).

Almost surely, 2^686149259 is an apocalyptic number.

686149259 is a deficient number, since it is larger than the sum of its proper divisors (1).

686149259 is an equidigital number, since it uses as much as digits as its factorization.

686149259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 686149259 is about 26194.4509199945. The cubic root of 686149259 is about 882.0086944226.

The spelling of 686149259 in words is "six hundred eighty-six million, one hundred forty-nine thousand, two hundred fifty-nine".