681989093 has 2 divisors, whose sum is σ = 681989094. Its totient is φ = 681989092.

The previous prime is 681989071. The next prime is 681989167. The reversal of 681989093 is 390989186.

681989093 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., 667602244 + 14386849 = 25838^2 + 3793^2 .

It is a cyclic number.

It is not a de Polignac number, because 681989093 - 2¹² = 681984997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681989023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340994546 + 340994547.

It is an arithmetic number, because the mean of its divisors is an integer number (340994547).

Almost surely, 2^681989093 is an apocalyptic number.

It is an amenable number.

681989093 is a deficient number, since it is larger than the sum of its proper divisors (1).

681989093 is an equidigital number, since it uses as much as digits as its factorization.

681989093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 681989093 is about 26114.9208882585. The cubic root of 681989093 is about 880.2225216370. Note that the first 3 decimals are identical.

The spelling of 681989093 in words is "six hundred eighty-one million, nine hundred eighty-nine thousand, ninety-three".