634720841 has 2 divisors, whose sum is σ = 634720842. Its totient is φ = 634720840.

The previous prime is 634720831. The next prime is 634720861. The reversal of 634720841 is 148027436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449652025 + 185068816 = 21205^2 + 13604^2 .

It is a cyclic number.

It is not a de Polignac number, because 634720841 - 2⁶ = 634720777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (634720831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317360420 + 317360421.

It is an arithmetic number, because the mean of its divisors is an integer number (317360421).

Almost surely, 2^634720841 is an apocalyptic number.

It is an amenable number.

634720841 is a deficient number, since it is larger than the sum of its proper divisors (1).

634720841 is an equidigital number, since it uses as much as digits as its factorization.

634720841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 634720841 is about 25193.6666843078. Note that the first 4 decimals coincide. The cubic root of 634720841 is about 859.3978302184.

The spelling of 634720841 in words is "six hundred thirty-four million, seven hundred twenty thousand, eight hundred forty-one".