634136502221281 has 2 divisors, whose sum is σ = 634136502221282. Its totient is φ = 634136502221280.

The previous prime is 634136502221267. The next prime is 634136502221329. The reversal of 634136502221281 is 182122205631436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572372369733025 + 61764132488256 = 23924305^2 + 7859016^2 .

It is a cyclic number.

It is not a de Polignac number, because 634136502221281 - 2²⁹ = 634135965350369 is a prime.

It is a super-2 number, since 2×634136502221281² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (634136502201281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317068251110640 + 317068251110641.

It is an arithmetic number, because the mean of its divisors is an integer number (317068251110641).

Almost surely, 2^{634136502221281} is an apocalyptic number.

It is an amenable number.

634136502221281 is a deficient number, since it is larger than the sum of its proper divisors (1).

634136502221281 is an equidigital number, since it uses as much as digits as its factorization.

634136502221281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 634136502221281 in words is "six hundred thirty-four trillion, one hundred thirty-six billion, five hundred two million, two hundred twenty-one thousand, two hundred eighty-one".