685217127 has 24 divisors (see below), whose sum is σ = 1108999296. Its totient is φ = 374526768.

The previous prime is 685217123. The next prime is 685217179. The reversal of 685217127 is 721712586.

It is not a de Polignac number, because 685217127 - 2² = 685217123 is a prime.

It is a super-2 number, since 2×685217127² = 939045022268268258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685217123) 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 23 ways as a sum of consecutive naturals, for example, 97953 + ... + 104714.

It is an arithmetic number, because the mean of its divisors is an integer number (46208304).

Almost surely, 2^685217127 is an apocalyptic number.

685217127 is a deficient number, since it is larger than the sum of its proper divisors (423782169).

685217127 is a wasteful number, since it uses less digits than its factorization.

685217127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202707 (or 202700 counting only the distinct ones).

The product of its digits is 47040, while the sum is 39.

The square root of 685217127 is about 26176.6523260710. The cubic root of 685217127 is about 881.6091112443.

The spelling of 685217127 in words is "six hundred eighty-five million, two hundred seventeen thousand, one hundred twenty-seven".