686301621 has 4 divisors (see below), whose sum is σ = 915068832. Its totient is φ = 457534412.

The previous prime is 686301619. The next prime is 686301647. The reversal of 686301621 is 126103686.

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 686301621 - 2¹ = 686301619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686301601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114383601 + ... + 114383606.

It is an arithmetic number, because the mean of its divisors is an integer number (228767208).

Almost surely, 2^686301621 is an apocalyptic number.

It is an amenable number.

686301621 is a deficient number, since it is larger than the sum of its proper divisors (228767211).

686301621 is a wasteful number, since it uses less digits than its factorization.

686301621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228767210.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 686301621 is about 26197.3590462856. The cubic root of 686301621 is about 882.0739740301.

The spelling of 686301621 in words is "six hundred eighty-six million, three hundred one thousand, six hundred twenty-one".