686146249 has 4 divisors (see below), whose sum is σ = 686807680. Its totient is φ = 685484820.

The previous prime is 686146213. The next prime is 686146261. The reversal of 686146249 is 942641686.

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 686146249 - 2⁷ = 686146121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686146199 and 686146208.

It is not an unprimeable number, because it can be changed into a prime (686146949) 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, 329157 + ... + 331234.

It is an arithmetic number, because the mean of its divisors is an integer number (171701920).

Almost surely, 2^686146249 is an apocalyptic number.

It is an amenable number.

686146249 is a deficient number, since it is larger than the sum of its proper divisors (661431).

686146249 is a wasteful number, since it uses less digits than its factorization.

686146249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661430.

The product of its digits is 497664, while the sum is 46.

The square root of 686146249 is about 26194.3934650146. The cubic root of 686146249 is about 882.0074046886.

The spelling of 686146249 in words is "six hundred eighty-six million, one hundred forty-six thousand, two hundred forty-nine".