681123263 has 2 divisors, whose sum is σ = 681123264. Its totient is φ = 681123262.

The previous prime is 681123259. The next prime is 681123271. The reversal of 681123263 is 362321186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681123263 - 2² = 681123259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681123463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340561631 + 340561632.

It is an arithmetic number, because the mean of its divisors is an integer number (340561632).

Almost surely, 2^681123263 is an apocalyptic number.

681123263 is a deficient number, since it is larger than the sum of its proper divisors (1).

681123263 is an equidigital number, since it uses as much as digits as its factorization.

681123263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 681123263 is about 26098.3383187513. The cubic root of 681123263 is about 879.8498637635.

The spelling of 681123263 in words is "six hundred eighty-one million, one hundred twenty-three thousand, two hundred sixty-three".