634396521 has 16 divisors (see below), whose sum is σ = 923290560. Its totient is φ = 384261120.

The previous prime is 634396513. The next prime is 634396537. The reversal of 634396521 is 125693436.

634396521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 634396521 - 2³ = 634396513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634396521.

It is not an unprimeable number, because it can be changed into a prime (634396541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66585 + ... + 75513.

It is an arithmetic number, because the mean of its divisors is an integer number (57705660).

Almost surely, 2^634396521 is an apocalyptic number.

It is an amenable number.

634396521 is a deficient number, since it is larger than the sum of its proper divisors (288894039).

634396521 is a wasteful number, since it uses less digits than its factorization.

634396521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11096.

The product of its digits is 116640, while the sum is 39.

The square root of 634396521 is about 25187.2293236076. The cubic root of 634396521 is about 859.2514312706.

The spelling of 634396521 in words is "six hundred thirty-four million, three hundred ninety-six thousand, five hundred twenty-one".