682041721 has 2 divisors, whose sum is σ = 682041722. Its totient is φ = 682041720.

The previous prime is 682041673. The next prime is 682041761. The reversal of 682041721 is 127140286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364810000 + 317231721 = 19100^2 + 17811^2 .

It is a cyclic number.

It is not a de Polignac number, because 682041721 - 2⁹ = 682041209 is a prime.

It is not a weakly prime, because it can be changed into another prime (682041761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341020860 + 341020861.

It is an arithmetic number, because the mean of its divisors is an integer number (341020861).

Almost surely, 2^682041721 is an apocalyptic number.

It is an amenable number.

682041721 is a deficient number, since it is larger than the sum of its proper divisors (1).

682041721 is an equidigital number, since it uses as much as digits as its factorization.

682041721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 682041721 is about 26115.9284920142. The cubic root of 682041721 is about 880.2451628394.

The spelling of 682041721 in words is "six hundred eighty-two million, forty-one thousand, seven hundred twenty-one".