682191421 has 2 divisors, whose sum is σ = 682191422. Its totient is φ = 682191420.

The previous prime is 682191407. The next prime is 682191439. The reversal of 682191421 is 124191286.

It is a happy number.

682191421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390260025 + 291931396 = 19755^2 + 17086^2 .

It is a cyclic number.

It is not a de Polignac number, because 682191421 - 2¹¹ = 682189373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (682191481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341095710 + 341095711.

It is an arithmetic number, because the mean of its divisors is an integer number (341095711).

Almost surely, 2^682191421 is an apocalyptic number.

It is an amenable number.

682191421 is a deficient number, since it is larger than the sum of its proper divisors (1).

682191421 is an equidigital number, since it uses as much as digits as its factorization.

682191421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The square root of 682191421 is about 26118.7944017330. The cubic root of 682191421 is about 880.3095592232.

The spelling of 682191421 in words is "six hundred eighty-two million, one hundred ninety-one thousand, four hundred twenty-one".