681262193 has 2 divisors, whose sum is σ = 681262194. Its totient is φ = 681262192.

The previous prime is 681262189. The next prime is 681262217. The reversal of 681262193 is 391262186.

It is a happy number.

681262193 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., 569156449 + 112105744 = 23857^2 + 10588^2 .

It is a cyclic number.

It is not a de Polignac number, because 681262193 - 2² = 681262189 is a prime.

It is a super-2 number, since 2×681262193² = 928236351222338498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681262103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340631096 + 340631097.

It is an arithmetic number, because the mean of its divisors is an integer number (340631097).

Almost surely, 2^681262193 is an apocalyptic number.

It is an amenable number.

681262193 is a deficient number, since it is larger than the sum of its proper divisors (1).

681262193 is an equidigital number, since it uses as much as digits as its factorization.

681262193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 681262193 is about 26100.9998467492. Note that the first 3 decimals coincide. The cubic root of 681262193 is about 879.9096812435.

The spelling of 681262193 in words is "six hundred eighty-one million, two hundred sixty-two thousand, one hundred ninety-three".