634506381 has 12 divisors (see below), whose sum is σ = 916741852. Its totient is φ = 422896896.

The previous prime is 634506373. The next prime is 634506403. The reversal of 634506381 is 183605436.

634506381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 271260900 + 363245481 = 16470^2 + 19059^2 .

It is not a de Polignac number, because 634506381 - 2³ = 634506373 is a prime.

It is a super-2 number, since 2×634506381² = 805196695059434322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634506781) 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, 46695 + ... + 58731.

Almost surely, 2^634506381 is an apocalyptic number.

It is an amenable number.

634506381 is a deficient number, since it is larger than the sum of its proper divisors (282235471).

634506381 is a wasteful number, since it uses less digits than its factorization.

634506381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17900 (or 17897 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 634506381 is about 25189.4100963083. The cubic root of 634506381 is about 859.3010279664.

The spelling of 634506381 in words is "six hundred thirty-four million, five hundred six thousand, three hundred eighty-one".