685492491 has 8 divisors (see below), whose sum is σ = 943473664. Its totient is φ = 442253160.

The previous prime is 685492487. The next prime is 685492499. The reversal of 685492491 is 194294586.

685492491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685492491 - 2² = 685492487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685492491.

It is not an unprimeable number, because it can be changed into a prime (685492499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3685351 + ... + 3685536.

It is an arithmetic number, because the mean of its divisors is an integer number (117934208).

Almost surely, 2^685492491 is an apocalyptic number.

685492491 is a deficient number, since it is larger than the sum of its proper divisors (257981173).

685492491 is a wasteful number, since it uses less digits than its factorization.

685492491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7370921.

The product of its digits is 622080, while the sum is 48.

The square root of 685492491 is about 26181.9115230344. The cubic root of 685492491 is about 881.7271910420.

The spelling of 685492491 in words is "six hundred eighty-five million, four hundred ninety-two thousand, four hundred ninety-one".