681252563 has 2 divisors, whose sum is σ = 681252564. Its totient is φ = 681252562.

The previous prime is 681252553. The next prime is 681252587. The reversal of 681252563 is 365252186.

681252563 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 is a cyclic number.

It is not a de Polignac number, because 681252563 - 2⁸ = 681252307 is a prime.

It is not a weakly prime, because it can be changed into another prime (681252553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340626281 + 340626282.

It is an arithmetic number, because the mean of its divisors is an integer number (340626282).

Almost surely, 2^681252563 is an apocalyptic number.

681252563 is a deficient number, since it is larger than the sum of its proper divisors (1).

681252563 is an equidigital number, since it uses as much as digits as its factorization.

681252563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The square root of 681252563 is about 26100.8153704056. The cubic root of 681252563 is about 879.9055352284.

The spelling of 681252563 in words is "six hundred eighty-one million, two hundred fifty-two thousand, five hundred sixty-three".