686653231 has 8 divisors (see below), whose sum is σ = 749401344. Its totient is φ = 623959320.

The previous prime is 686653223. The next prime is 686653237. The reversal of 686653231 is 132356686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686653231 - 2³ = 686653223 is a prime.

It is a super-2 number, since 2×686653231² = 942985319285478722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686653237) 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, 15700 + ... + 40246.

It is an arithmetic number, because the mean of its divisors is an integer number (93675168).

Almost surely, 2^686653231 is an apocalyptic number.

686653231 is a deficient number, since it is larger than the sum of its proper divisors (62748113).

686653231 is a wasteful number, since it uses less digits than its factorization.

686653231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27101.

The product of its digits is 155520, while the sum is 40.

The square root of 686653231 is about 26204.0689779278. The cubic root of 686653231 is about 882.2245847190.

The spelling of 686653231 in words is "six hundred eighty-six million, six hundred fifty-three thousand, two hundred thirty-one".