686958241 has 4 divisors (see below), whose sum is σ = 687044800. Its totient is φ = 686871684.

The previous prime is 686958229. The next prime is 686958247. The reversal of 686958241 is 142859686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686958241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686958247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30021 + ... + 47698.

It is an arithmetic number, because the mean of its divisors is an integer number (171761200).

Almost surely, 2^686958241 is an apocalyptic number.

It is an amenable number.

686958241 is a deficient number, since it is larger than the sum of its proper divisors (86559).

686958241 is an equidigital number, since it uses as much as digits as its factorization.

686958241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86558.

The product of its digits is 829440, while the sum is 49.

The square root of 686958241 is about 26209.8882294450. Note that the first 3 decimals coincide. The cubic root of 686958241 is about 882.3551928512.

The spelling of 686958241 in words is "six hundred eighty-six million, nine hundred fifty-eight thousand, two hundred forty-one".