634537993 has 4 divisors (see below), whose sum is σ = 636605200. Its totient is φ = 632470788.

The previous prime is 634537991. The next prime is 634537999. The reversal of 634537993 is 399735436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634537993 - 2¹ = 634537991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634537991) 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, 1033143 + ... + 1033756.

It is an arithmetic number, because the mean of its divisors is an integer number (159151300).

Almost surely, 2^634537993 is an apocalyptic number.

It is an amenable number.

634537993 is a deficient number, since it is larger than the sum of its proper divisors (2067207).

634537993 is a wasteful number, since it uses less digits than its factorization.

634537993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067206.

The product of its digits is 1837080, while the sum is 49.

The square root of 634537993 is about 25190.0375744063. The cubic root of 634537993 is about 859.3152982578.

The spelling of 634537993 in words is "six hundred thirty-four million, five hundred thirty-seven thousand, nine hundred ninety-three".