685993111 has 4 divisors (see below), whose sum is σ = 692785224. Its totient is φ = 679201000.

The previous prime is 685993073. The next prime is 685993123. The reversal of 685993111 is 111399586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111399586 = 2 ⋅55699793.

It is a cyclic number.

It is not a de Polignac number, because 685993111 - 2¹⁷ = 685862039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685993171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395905 + ... + 3396106.

It is an arithmetic number, because the mean of its divisors is an integer number (173196306).

Almost surely, 2^685993111 is an apocalyptic number.

685993111 is a deficient number, since it is larger than the sum of its proper divisors (6792113).

685993111 is a wasteful number, since it uses less digits than its factorization.

685993111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792112.

The product of its digits is 58320, while the sum is 43.

The square root of 685993111 is about 26191.4701954663. The cubic root of 685993111 is about 881.9417826730.

The spelling of 685993111 in words is "six hundred eighty-five million, nine hundred ninety-three thousand, one hundred eleven".