682217621 has 4 divisors (see below), whose sum is σ = 682538112. Its totient is φ = 681897132.

The previous prime is 682217611. The next prime is 682217623. The reversal of 682217621 is 126712286.

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 a de Polignac number, because none of the positive numbers 2^k-682217621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (682217623) 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, 157031 + ... + 161316.

It is an arithmetic number, because the mean of its divisors is an integer number (170634528).

Almost surely, 2^682217621 is an apocalyptic number.

It is an amenable number.

682217621 is a deficient number, since it is larger than the sum of its proper divisors (320491).

682217621 is a wasteful number, since it uses less digits than its factorization.

682217621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320490.

The product of its digits is 16128, while the sum is 35.

The square root of 682217621 is about 26119.2959514609. The cubic root of 682217621 is about 880.3208286971.

The spelling of 682217621 in words is "six hundred eighty-two million, two hundred seventeen thousand, six hundred twenty-one".