686196997 has 4 divisors (see below), whose sum is σ = 708332416. Its totient is φ = 664061580.

The previous prime is 686196941. The next prime is 686197003. The reversal of 686196997 is 799691686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686196997 - 2¹⁹ = 685672709 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 (686196937) 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, 11067663 + ... + 11067724.

It is an arithmetic number, because the mean of its divisors is an integer number (177083104).

Almost surely, 2^686196997 is an apocalyptic number.

It is an amenable number.

686196997 is a deficient number, since it is larger than the sum of its proper divisors (22135419).

686196997 is a wasteful number, since it uses less digits than its factorization.

686196997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22135418.

The product of its digits is 8817984, while the sum is 61.

The square root of 686196997 is about 26195.3621276744. The cubic root of 686196997 is about 882.0291488422.

The spelling of 686196997 in words is "six hundred eighty-six million, one hundred ninety-six thousand, nine hundred ninety-seven".