682121817 has 20 divisors (see below), whose sum is σ = 1097356260. Its totient is φ = 419766624.

The previous prime is 682121809. The next prime is 682121863. The reversal of 682121817 is 718121286.

It can be written as a sum of positive squares in 2 ways, for example, as 39803481 + 642318336 = 6309^2 + 25344^2 .

It is not a de Polignac number, because 682121817 - 2³ = 682121809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (682121807) 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 19 ways as a sum of consecutive naturals, for example, 322842 + ... + 324947.

It is an arithmetic number, because the mean of its divisors is an integer number (54867813).

Almost surely, 2^682121817 is an apocalyptic number.

It is an amenable number.

682121817 is a deficient number, since it is larger than the sum of its proper divisors (415234443).

682121817 is a wasteful number, since it uses less digits than its factorization.

682121817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647814 (or 647805 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 682121817 is about 26117.4619172691. The cubic root of 682121817 is about 880.2796188728.

The spelling of 682121817 in words is "six hundred eighty-two million, one hundred twenty-one thousand, eight hundred seventeen".