634834637 has 2 divisors, whose sum is σ = 634834638. Its totient is φ = 634834636.

The previous prime is 634834619. The next prime is 634834657. The reversal of 634834637 is 736438436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528724036 + 106110601 = 22994^2 + 10301^2 .

It is a cyclic number.

It is not a de Polignac number, because 634834637 - 2²⁴ = 618057421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634834657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317417318 + 317417319.

It is an arithmetic number, because the mean of its divisors is an integer number (317417319).

Almost surely, 2^634834637 is an apocalyptic number.

It is an amenable number.

634834637 is a deficient number, since it is larger than the sum of its proper divisors (1).

634834637 is an equidigital number, since it uses as much as digits as its factorization.

634834637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 44.

The square root of 634834637 is about 25195.9250078262. The cubic root of 634834637 is about 859.4491862295.

The spelling of 634834637 in words is "six hundred thirty-four million, eight hundred thirty-four thousand, six hundred thirty-seven".