686362321 has 4 divisors (see below), whose sum is σ = 704912692. Its totient is φ = 667811952.

The previous prime is 686362319. The next prime is 686362333. The reversal of 686362321 is 123263686.

It is the 10696-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261177921 + 425184400 = 16161^2 + 20620^2 .

It is a cyclic number.

It is not a de Polignac number, because 686362321 - 2¹ = 686362319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 18550333 = 686362321 / (6 + 8 + 6 + 3 + 6 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686362121) 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, 9275130 + ... + 9275203.

It is an arithmetic number, because the mean of its divisors is an integer number (176228173).

Almost surely, 2^686362321 is an apocalyptic number.

It is an amenable number.

686362321 is a deficient number, since it is larger than the sum of its proper divisors (18550371).

686362321 is a wasteful number, since it uses less digits than its factorization.

686362321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18550370.

The product of its digits is 62208, while the sum is 37.

The square root of 686362321 is about 26198.5175343950. The cubic root of 686362321 is about 882.0999782971.

The spelling of 686362321 in words is "six hundred eighty-six million, three hundred sixty-two thousand, three hundred twenty-one".