686231001 has 8 divisors (see below), whose sum is σ = 1016638560. Its totient is φ = 457487316.

The previous prime is 686230997. The next prime is 686231009. The reversal of 686231001 is 100132686.

It is not a de Polignac number, because 686231001 - 2² = 686230997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25415963 = 686231001 / (6 + 8 + 6 + 2 + 3 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (686231009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12707955 + ... + 12708008.

It is an arithmetic number, because the mean of its divisors is an integer number (127079820).

Almost surely, 2^686231001 is an apocalyptic number.

It is an amenable number.

686231001 is a deficient number, since it is larger than the sum of its proper divisors (330407559).

686231001 is a wasteful number, since it uses less digits than its factorization.

686231001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25415972 (or 25415966 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 686231001 is about 26196.0111658245. The cubic root of 686231001 is about 882.0437180422.

Adding to 686231001 its reverse (100132686), we get a palindrome (786363687).

The spelling of 686231001 in words is "six hundred eighty-six million, two hundred thirty-one thousand, one".