681010591 has 2 divisors, whose sum is σ = 681010592. Its totient is φ = 681010590.

The previous prime is 681010553. The next prime is 681010607. The reversal of 681010591 is 195010186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681010591 - 2⁹ = 681010079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681010501) 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, 340505295 + 340505296.

It is an arithmetic number, because the mean of its divisors is an integer number (340505296).

Almost surely, 2^681010591 is an apocalyptic number.

681010591 is a deficient number, since it is larger than the sum of its proper divisors (1).

681010591 is an equidigital number, since it uses as much as digits as its factorization.

681010591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 681010591 is about 26096.1796246117. The cubic root of 681010591 is about 879.8013459127.

The spelling of 681010591 in words is "six hundred eighty-one million, ten thousand, five hundred ninety-one".