634520121 has 16 divisors (see below), whose sum is σ = 924691968. Its totient is φ = 385286400.

The previous prime is 634520093. The next prime is 634520123. The reversal of 634520121 is 121025436.

It is not a de Polignac number, because 634520121 - 2⁹ = 634519609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634520091 and 634520100.

It is not an unprimeable number, because it can be changed into a prime (634520123) 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, 199090 + ... + 202251.

It is an arithmetic number, because the mean of its divisors is an integer number (57793248).

Almost surely, 2^634520121 is an apocalyptic number.

It is an amenable number.

634520121 is a deficient number, since it is larger than the sum of its proper divisors (290171847).

634520121 is a wasteful number, since it uses less digits than its factorization.

634520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401392.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 634520121 is about 25189.6828284915. The cubic root of 634520121 is about 859.3072305365.

Adding to 634520121 its reverse (121025436), we get a palindrome (755545557).

The spelling of 634520121 in words is "six hundred thirty-four million, five hundred twenty thousand, one hundred twenty-one".