634421573 has 4 divisors (see below), whose sum is σ = 651568140. Its totient is φ = 617275008.

The previous prime is 634421561. The next prime is 634421597. The reversal of 634421573 is 375124436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 366837409 + 267584164 = 19153^2 + 16358^2 .

It is a cyclic number.

It is not a de Polignac number, because 634421573 - 2⁶ = 634421509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634721573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8573228 + ... + 8573301.

It is an arithmetic number, because the mean of its divisors is an integer number (162892035).

Almost surely, 2^634421573 is an apocalyptic number.

It is an amenable number.

634421573 is a deficient number, since it is larger than the sum of its proper divisors (17146567).

634421573 is a wasteful number, since it uses less digits than its factorization.

634421573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17146566.

The product of its digits is 60480, while the sum is 35.

The square root of 634421573 is about 25187.7266342161. The cubic root of 634421573 is about 859.2627415909.

The spelling of 634421573 in words is "six hundred thirty-four million, four hundred twenty-one thousand, five hundred seventy-three".