634475521 has 2 divisors, whose sum is σ = 634475522. Its totient is φ = 634475520.

The previous prime is 634475507. The next prime is 634475537. The reversal of 634475521 is 125574436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629457921 + 5017600 = 25089^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 634475521 - 2¹⁷ = 634344449 is a prime.

It is equal to p_33027868 and since 634475521 and 33027868 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (634475221) 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 as a sum of consecutive naturals, namely, 317237760 + 317237761.

It is an arithmetic number, because the mean of its divisors is an integer number (317237761).

Almost surely, 2^634475521 is an apocalyptic number.

It is an amenable number.

634475521 is a deficient number, since it is larger than the sum of its proper divisors (1).

634475521 is an equidigital number, since it uses as much as digits as its factorization.

634475521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 37.

The square root of 634475521 is about 25188.7975298544. The cubic root of 634475521 is about 859.2870966856.

The spelling of 634475521 in words is "six hundred thirty-four million, four hundred seventy-five thousand, five hundred twenty-one".