681599827 has 2 divisors, whose sum is σ = 681599828. Its totient is φ = 681599826.

The previous prime is 681599783. The next prime is 681599839. The reversal of 681599827 is 728995186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681599827 is a prime.

It is not a weakly prime, because it can be changed into another prime (681599857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340799913 + 340799914.

It is an arithmetic number, because the mean of its divisors is an integer number (340799914).

Almost surely, 2^681599827 is an apocalyptic number.

681599827 is a deficient number, since it is larger than the sum of its proper divisors (1).

681599827 is an equidigital number, since it uses as much as digits as its factorization.

681599827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The square root of 681599827 is about 26107.4668821010. The cubic root of 681599827 is about 880.0550185126.

The spelling of 681599827 in words is "six hundred eighty-one million, five hundred ninety-nine thousand, eight hundred twenty-seven".