686251081 has 4 divisors (see below), whose sum is σ = 686402064. Its totient is φ = 686100100.

The previous prime is 686251073. The next prime is 686251103. The reversal of 686251081 is 180152686.

686251081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 686251081 - 2³ = 686251073 is a prime.

It is a super-2 number, since 2×686251081² = 941881092347337122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686251081.

It is not an unprimeable number, because it can be changed into a prime (686251021) 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, 68455 + ... + 77836.

It is an arithmetic number, because the mean of its divisors is an integer number (171600516).

Almost surely, 2^686251081 is an apocalyptic number.

It is an amenable number.

686251081 is a deficient number, since it is larger than the sum of its proper divisors (150983).

686251081 is a wasteful number, since it uses less digits than its factorization.

686251081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150982.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 686251081 is about 26196.3944274780. The cubic root of 686251081 is about 882.0523212021.

The spelling of 686251081 in words is "six hundred eighty-six million, two hundred fifty-one thousand, eighty-one".