681497923 has 2 divisors, whose sum is σ = 681497924. Its totient is φ = 681497922.

The previous prime is 681497897. The next prime is 681497933. The reversal of 681497923 is 329794186.

681497923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681497923 - 2⁵ = 681497891 is a prime.

It is not a weakly prime, because it can be changed into another prime (681497933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340748961 + 340748962.

It is an arithmetic number, because the mean of its divisors is an integer number (340748962).

Almost surely, 2^681497923 is an apocalyptic number.

681497923 is a deficient number, since it is larger than the sum of its proper divisors (1).

681497923 is an equidigital number, since it uses as much as digits as its factorization.

681497923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 49.

The square root of 681497923 is about 26105.5151835776. The cubic root of 681497923 is about 880.0111581746.

The spelling of 681497923 in words is "six hundred eighty-one million, four hundred ninety-seven thousand, nine hundred twenty-three".