634123634 has 4 divisors (see below), whose sum is σ = 951185454. Its totient is φ = 317061816.

The previous prime is 634123621. The next prime is 634123663. The reversal of 634123634 is 436321436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 629859409 + 4264225 = 25097^2 + 2065^2 .

It is a super-2 number, since 2×634123634² = 804225566394731912, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 634123634.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158530907 + ... + 158530910.

Almost surely, 2^634123634 is an apocalyptic number.

634123634 is a deficient number, since it is larger than the sum of its proper divisors (317061820).

634123634 is a wasteful number, since it uses less digits than its factorization.

634123634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317061819.

The product of its digits is 31104, while the sum is 32.

The square root of 634123634 is about 25181.8115710526. The cubic root of 634123634 is about 859.1282106633.

The spelling of 634123634 in words is "six hundred thirty-four million, one hundred twenty-three thousand, six hundred thirty-four".