634641281 has 2 divisors, whose sum is σ = 634641282. Its totient is φ = 634641280.

The previous prime is 634641251. The next prime is 634641311. The reversal of 634641281 is 182146436.

It is a balanced prime because it is at equal distance from previous prime (634641251) and next prime (634641311).

It can be written as a sum of positive squares in only one way, i.e., 535459600 + 99181681 = 23140^2 + 9959^2 .

It is a cyclic number.

It is not a de Polignac number, because 634641281 - 2¹⁰ = 634640257 is a prime.

It is a super-2 number, since 2×634641281² = 805539111098641922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634641251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317320640 + 317320641.

It is an arithmetic number, because the mean of its divisors is an integer number (317320641).

Almost surely, 2^634641281 is an apocalyptic number.

It is an amenable number.

634641281 is a deficient number, since it is larger than the sum of its proper divisors (1).

634641281 is an equidigital number, since it uses as much as digits as its factorization.

634641281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 634641281 is about 25192.0876665671. The cubic root of 634641281 is about 859.3619212308.

The spelling of 634641281 in words is "six hundred thirty-four million, six hundred forty-one thousand, two hundred eighty-one".