686681101 has 4 divisors (see below), whose sum is σ = 686986272. Its totient is φ = 686375932.

The previous prime is 686681081. The next prime is 686681137. The reversal of 686681101 is 101186686.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-686681101 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 (686601101) 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, 149185 + ... + 153718.

It is an arithmetic number, because the mean of its divisors is an integer number (171746568).

Almost surely, 2^686681101 is an apocalyptic number.

It is an amenable number.

686681101 is a deficient number, since it is larger than the sum of its proper divisors (305171).

686681101 is a wasteful number, since it uses less digits than its factorization.

686681101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305170.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 686681101 is about 26204.6007601719. The cubic root of 686681101 is about 882.2365205189.

The spelling of 686681101 in words is "six hundred eighty-six million, six hundred eighty-one thousand, one hundred one".