681020213 has 2 divisors, whose sum is σ = 681020214. Its totient is φ = 681020212.

The previous prime is 681020167. The next prime is 681020237. The reversal of 681020213 is 312020186.

681020213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548355889 + 132664324 = 23417^2 + 11518^2 .

It is a cyclic number.

It is not a de Polignac number, because 681020213 - 2⁶ = 681020149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681020243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340510106 + 340510107.

It is an arithmetic number, because the mean of its divisors is an integer number (340510107).

Almost surely, 2^681020213 is an apocalyptic number.

It is an amenable number.

681020213 is a deficient number, since it is larger than the sum of its proper divisors (1).

681020213 is an equidigital number, since it uses as much as digits as its factorization.

681020213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 681020213 is about 26096.3639804475. The cubic root of 681020213 is about 879.8054894648.

Adding to 681020213 its reverse (312020186), we get a palindrome (993040399).

The spelling of 681020213 in words is "six hundred eighty-one million, twenty thousand, two hundred thirteen".