685191447 has 16 divisors (see below), whose sum is σ = 1017792000. Its totient is φ = 455582232.

The previous prime is 685191383. The next prime is 685191461. The reversal of 685191447 is 744191586.

685191447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685191447 - 2⁶ = 685191383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685191487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23247 + ... + 43712.

It is an arithmetic number, because the mean of its divisors is an integer number (63612000).

Almost surely, 2^685191447 is an apocalyptic number.

685191447 is a deficient number, since it is larger than the sum of its proper divisors (332600553).

685191447 is a wasteful number, since it uses less digits than its factorization.

685191447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67347 (or 67341 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 685191447 is about 26176.1618080268. The cubic root of 685191447 is about 881.5980977013.

The spelling of 685191447 in words is "six hundred eighty-five million, one hundred ninety-one thousand, four hundred forty-seven".