685277091 has 20 divisors (see below), whose sum is σ = 1024627032. Its totient is φ = 456431328.

The previous prime is 685277081. The next prime is 685277093. The reversal of 685277091 is 190772586.

It is not a de Polignac number, because 685277091 - 2⁵ = 685277059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685277093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 102631 + ... + 109103.

Almost surely, 2^685277091 is an apocalyptic number.

685277091 is a deficient number, since it is larger than the sum of its proper divisors (339349941).

685277091 is a wasteful number, since it uses less digits than its factorization.

685277091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7792 (or 7783 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 685277091 is about 26177.7976728372. The cubic root of 685277091 is about 881.6348273103.

The spelling of 685277091 in words is "six hundred eighty-five million, two hundred seventy-seven thousand, ninety-one".