634514561 has 2 divisors, whose sum is σ = 634514562. Its totient is φ = 634514560.

The previous prime is 634514537. The next prime is 634514581. The reversal of 634514561 is 165415436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515290000 + 119224561 = 22700^2 + 10919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634514561 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 (634514521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317257280 + 317257281.

It is an arithmetic number, because the mean of its divisors is an integer number (317257281).

Almost surely, 2^634514561 is an apocalyptic number.

It is an amenable number.

634514561 is a deficient number, since it is larger than the sum of its proper divisors (1).

634514561 is an equidigital number, since it uses as much as digits as its factorization.

634514561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 634514561 is about 25189.5724656057. The cubic root of 634514561 is about 859.3047206281.

Adding to 634514561 its reverse (165415436), we get a palindrome (799929997).

The spelling of 634514561 in words is "six hundred thirty-four million, five hundred fourteen thousand, five hundred sixty-one".