634121005 has 12 divisors (see below), whose sum is σ = 885181500. Its totient is φ = 434825664.

The previous prime is 634121003. The next prime is 634121023. The reversal of 634121005 is 500121436.

It can be written as a sum of positive squares in 2 ways, for example, as 125753796 + 508367209 = 11214^2 + 22547^2 .

It is not a de Polignac number, because 634121005 - 2¹ = 634121003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634121003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1293880 + ... + 1294369.

It is an arithmetic number, because the mean of its divisors is an integer number (73765125).

Almost surely, 2^634121005 is an apocalyptic number.

It is an amenable number.

634121005 is a deficient number, since it is larger than the sum of its proper divisors (251060495).

634121005 is a wasteful number, since it uses less digits than its factorization.

634121005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588268 (or 2588261 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 634121005 is about 25181.7593706238. The cubic root of 634121005 is about 859.1270233810.

The spelling of 634121005 in words is "six hundred thirty-four million, one hundred twenty-one thousand, five".